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 --- Roman Empire ---
 
 The Roman Empire was a state that controlled the Mediterranean and much of Western Europe, Western Asia, and North Africa during the classical period. The Roman Republic had previously conquered most of these territories, which became ruled by emperors following triumvir Octavian's rise to power and establishment of a Principate regime in 27 BC.  By the 4th century AD the empire split into western and eastern halves. The Western Empire collapsed in 476 AD, while the Eastern Empire endured until the fall of Constantinople in 1453.
 By 100 BC, the city of Rome had expanded its rule from the Italian peninsula to most of the Mediterranean and beyond. However, it was severely destabilised by civil wars and political conflicts, which culminated in the victory of Octavian over Mark Antony and Cleopatra at the Battle of Actium in 31 BC, and the subsequent conquest of the Ptolemaic Kingdom in Egypt. In 27 BC, the Roman Senate granted Octavian overarching military power (imperium) and the new title of Augustus, marking his accession as the first Roman emperor. The vast Roman territories were organized into senatorial provinces, governed by proconsuls who were appointed by lot annually, and imperial provinces, which belonged to the emperor but were governed by legates.
 The first two centuries of the Empire saw a period of unprecedented stability and prosperity known as the Pax Romana (lit. 'Roman Peace'). Rome reached its greatest territorial extent under Trajan (r. 98–117 AD), but a period of increasing trouble and decline began under Commodus (r. 180–192). In the 3rd century, the Empire underwent a 49-year crisis that threatened its existence due to civil war, plagues and barbarian invasions. The Gallic and Palmyrene empires broke away from the state and a series of short-lived emperors led the Empire, which was later reunified under Aurelian (r. 270–275). The civil wars ended with the victory of Diocletian (r. 284–305), who set up two different imperial courts in the Greek East and Latin West. Constantine the Great (r. 306–337), the first Christian emperor, moved the imperial seat from Rome to Byzantium in 330, and renamed it Constantinople. The Migration Period, involving large invasions by Germanic peoples and by the Huns of Attila, led to the decline of the Western Roman Empire. With the fall of Ravenna to the Germanic Herulians and the deposition of Romulus Augustus in 476 by Odoacer, the Western Empire finally collapsed. The Byzantine (Eastern Roman) Empire survived for another millennium with Constantinople as its sole capital, until the city's fall in 1453.
 Due to the Empire's extent and endurance, its institutions and culture had a lasting influence on the development of language, religion, art, architecture, literature, philosophy, law, and forms of government across its territories. Latin evolved into the Romance languages while Medieval Greek became the language of the East. The Empire's adoption of Christianity resulted in the formation of medieval Christendom. Roman and Greek art had a profound impact on the Italian Renaissance. Rome's architectural tradition served as the basis for Romanesque, Renaissance, and Neoclassical architecture, influencing Islamic architecture. The rediscovery of classical science and technology (which formed the basis for Islamic science) in medieval Europe contributed to the Scientific Renaissance and Scientific Revolution. Many modern legal systems, such as the Napoleonic Code, descend from Roman law. Rome's republican institutions have influenced the Italian city-state republics of the medieval period, the early United States, and modern democratic republics.
 
 
 == History ==
 
 
 === Transition from Republic to Empire ===
 
 Rome had begun expanding shortly after the founding of the Roman Republic in the 6th century BC, though not outside the Italian Peninsula until the 3rd century BC. The Republic was not a nation-state in the modern sense, but a network of self-ruled towns (with varying degrees of independence from the Senate) and provinces administered by military commanders. It was governed by annually elected magistrates (Roman consuls above all) in conjunction with the Senate. The 1st century BC was a time of political and military upheaval, which ultimately led to rule by emperors. The consuls' military power rested in the Roman legal concept of imperium, meaning "command" (typically in a military sense). Occasionally, successful consuls or generals were given the honorary title imperator (commander); this is the origin of the word emperor, since this title was always bestowed to the early emperors.
 Rome suffered a long series of internal conflicts, conspiracies, and civil wars from the late second century BC, (see Crisis of the Roman Republic) while greatly extending its power beyond Italy. In 44 BC Julius Caesar was briefly perpetual dictator before being assassinated by a faction that opposed his concentration of power. This faction was driven from Rome and defeated at the Battle of Philippi in 42 BC by Mark Antony and Caesar's adopted son Octavian. Antony and Octavian divided the Roman world between them, but this did not last long. Octavian's forces defeated those of Mark Antony and Cleopatra at the Battle of Actium in 31 BC. In 27 BC the Senate gave him the title Augustus ("venerated") and made him princeps ("foremost") with proconsular imperium, thus beginning the Principate, the first epoch of Roman imperial history. Although the republic stood in name, Augustus had all meaningful authority. During his 40-year rule, a new constitutional order emerged so that, upon his death, Tiberius would succeed him as the new de facto monarch.
 
 
 === Pax Romana ===
 
 The 200 years that began with Augustus's rule are traditionally regarded as the Pax Romana ("Roman Peace"). The cohesion of the empire was furthered by a degree of social stability and economic prosperity that Rome had never before experienced. Uprisings in the provinces were infrequent and put down "mercilessly and swiftly". The success of Augustus in establishing principles of dynastic succession was limited by his outliving a number of talented potential heirs. The Julio-Claudian dynasty lasted for four more emperors—Tiberius, Caligula, Claudius, and Nero—before it yielded in 69 AD to the strife-torn Year of the Four Emperors, from which Vespasian emerged as the victor. Vespasian became the founder of the brief Flavian dynasty, followed by the Nerva–Antonine dynasty which produced the "Five Good Emperors": Nerva, Trajan, Hadrian, Antoninus Pius, and Marcus Aurelius.
 Among the so-called "Five Good Emperors", Hadrian (r. 117–138) is particularly noted for consolidating the empire's frontiers and embarking on ambitious building projects throughout the provinces. In Judaea, which had long been the center of Jewish national and religious life, his reign marked a decisive turning point. After earlier Jewish resistance to Roman rule, Hadrian visited the region in 129/130 AD and refounded Jerusalem as the Roman colony Aelia Capitolina, naming it after his family (Aelius) and the Capitoline Triad. The refoundation overlaid the destroyed Jewish city with a new Roman urban plan, and included the construction of a Temple to Jupiter on the site of the former Jewish Temple. Later tradition and archaeological evidence also indicate a Temple of Venus near the site of the Holy Sepulchre.
 Hadrian's measures, combined with restrictions on Jewish practices, helped spark the Bar Kokhba Revolt (132–135 AD). After crushing the uprising, Roman forces expelled most Jews from Jerusalem, barring their entry except on certain days, and rebuilt the city as a statement of imperial power and domination. Most scholars consider Hadrianic Aelia to have been unwalled, with free-standing gate complexes (such as the northern gate beneath today's Damascus Gate) rather than a continuous defensive circuit.
 
 
 === Transition from classical to late antiquity ===
 
 In the view of contemporary Greek historian Cassius Dio, the accession of Commodus in 180 marked the descent "from a kingdom of gold to one of rust and iron", a comment which has led some historians, notably Edward Gibbon, to take Commodus' reign as the beginning of the Empire's decline.
 In 212, during the reign of Caracalla, Roman citizenship was granted to all freeborn inhabitants of the empire. The Severan dynasty was tumultuous; an emperor's reign was ended routinely by his murder or execution and, following its collapse, the Empire was engulfed by the Crisis of the Third Century, a period of invasions, civil strife, economic disorder, and plague. In defining historical epochs, this crisis sometimes marks the transition from classical to late antiquity. Aurelian (r. 270–275) stabilised the empire militarily and Diocletian reorganised and restored much of it in 285. Diocletian's reign brought the empire's most concerted effort against the perceived threat of Christianity, the "Great Persecution".
 Diocletian divided the empire into four regions, each ruled by a separate tetrarch. Confident that he fixed the disorder plaguing Rome, he abdicated along with his co-emperor, but the Tetrarchy collapsed shortly after. Order was eventually restored by Constantine the Great, who became the first emperor to convert to Christianity, and who established Constantinople as the new capital of the Eastern Empire. During the decades of the Constantinian and Valentinian dynasties, the empire was divided along an east–west axis, with dual power centres in Constantinople and Rome. Julian, who under the influence of his adviser Mardonius attempted to restore Classical Roman and Hellenistic religion, only briefly interrupted the succession of Christian emperors. Theodosius I, the last emperor to rule over both East and West, died in 395 after making Christianity the state religion.
 
  
 
 
 === Fall in the West and survival in the East ===
 The Western Roman Empire began to disintegrate in the early 5th century. The Romans fought off all invaders, most famously Attila, but the empire had assimilated so many Germanic peoples of dubious loyalty to Rome that the empire started to dismember itself. Most chronologies place the end of the Western Roman Empire in 476, when Romulus Augustulus was forced to abdicate to the Germanic warlord Odoacer.
 Odoacer ended the Western Empire by declaring Zeno sole emperor and placing himself as Zeno's nominal subordinate. In reality, Italy was ruled by Odoacer alone. The Eastern Roman Empire, called the Byzantine Empire by later historians, continued until the reign of Constantine XI Palaiologos, the last Roman emperor. He died in battle in 1453 against Mehmed II and his Ottoman forces during the siege of Constantinople. Mehmed II adopted the title of caesar in an attempt to claim a connection to the former Empire. His claim was soon recognized by the Patriarchate of Constantinople, but not by European monarchs.
 
 
 == Geography and demography ==
 
 The Roman Empire was one of the largest in history, with contiguous territories throughout Europe, North Africa, and the Middle East. The Latin phrase imperium sine fine ("empire without end") expressed the ideology that neither time nor space limited the Empire. In Virgil's Aeneid, limitless empire is said to be granted to the Romans by Jupiter. This claim of universal dominion was renewed when the Empire came under Christian rule in the 4th century. In addition to annexing large regions, the Romans directly altered their geography, for example cutting down entire forests.
 Roman expansion was mostly accomplished under the Republic, though parts of northern Europe were conquered in the 1st century, when Roman control in Europe, Africa, and Asia was strengthened. Under Augustus, a "global map of the known world" was displayed for the first time in public at Rome, coinciding with the creation of the most comprehensive political geography that survives from antiquity, the Geography of Strabo. When Augustus died, the account of his achievements (Res Gestae) prominently featured the geographical cataloguing of the Empire. Geography alongside meticulous written records were central concerns of Roman Imperial administration.
 
 The Empire reached its largest expanse under Trajan (r. 98–117), encompassing 5 million km2. The traditional population estimate of 55–60 million inhabitants accounted for between one-sixth and one-fourth of the world's total population and made it the most populous unified political entity in the West until the mid-19th century. 21st-century demographic studies have argued for a population peak from 70 million to more than 100 million. Each of the three largest cities in the Empire—Rome, Alexandria, and Antioch—was almost twice the size of any European city at the beginning of the 17th century.
 As the historian Christopher Kelly described it:
 
 Then the empire stretched from Hadrian's Wall in drizzle-soaked northern England to the sun-baked banks of the Euphrates in Syria; from the great Rhine–Danube river system, which snaked across the fertile, flat lands of Europe from the Low Countries to the Black Sea, to the rich plains of the North African coast and the luxuriant gash of the Nile Valley in Egypt. The empire completely circled the Mediterranean ... referred to by its conquerors as mare nostrum—'our sea'.
 
 Trajan's successor Hadrian adopted a policy of maintaining rather than expanding the empire. Borders (fines) were marked, and the frontiers (limites) patrolled. The most heavily fortified borders were the most unstable. Hadrian's Wall, which separated the Roman world from what was perceived as an ever-present barbarian threat, is the primary surviving monument of this effort. In the eastern provinces, rural administration often relied on inscribed boundary stones to demarcate land and regulate taxation.
 
 
 == Languages ==
 
 Latin and Greek were the main languages of the Empire, but the Empire was deliberately multilingual. Andrew Wallace-Hadrill says "The main desire of the Roman government was to make itself understood". At the start of the Empire, knowledge of Greek was useful to pass as educated nobility and knowledge of Latin was useful for a career in the military, government, or law. Bilingual inscriptions indicate the everyday interpenetration of the two languages.
 Latin and Greek's mutual linguistic and cultural influence is a complex topic. Latin words incorporated into Greek were very common by the early imperial era, especially for military, administration, and trade and commerce matters. Greek grammar, literature, poetry and philosophy shaped Latin language and culture.
 
 There was never a legal requirement for Latin in the Empire, but it represented a certain status. High standards of Latin, Latinitas, started with the advent of Latin literature. Due to the flexible language policy of the Empire, a natural competition of language emerged that spurred Latinitas, to defend Latin against the stronger cultural influence of Greek. Over time Latin usage was used to project power and a higher social class. Most of the emperors were bilingual but had a preference for Latin in the public sphere for political reasons, a "rule" that first started during the Punic Wars. Different emperors up until Justinian would attempt to require the use of Latin in various sections of the administration but there is no evidence that a linguistic imperialism existed during the early Empire.
 After all freeborn inhabitants were universally enfranchised in 212, many Roman citizens lacked a knowledge of Latin. The wide use of Koine Greek was what enabled the spread of Christianity and reflects its role as the lingua franca of the Mediterranean during the time of the Empire. Following Diocletian's reforms in the 3rd century AD, there was a decline in the knowledge of Greek in the west. Spoken Latin later fragmented into the incipient romance languages in the 7th century AD following the collapse of the Empire's west.
 The dominance of Latin and Greek among the literate elite obscures the continuity of other spoken languages within the Empire. Latin, referred to in its spoken form as Vulgar Latin, gradually replaced Celtic and Italic languages. References to interpreters indicate the continuing use of local languages, particularly in Egypt with Coptic, and in military settings along the Rhine and Danube. Roman jurists also show a concern for local languages such as Punic, Gaulish, and Aramaic in assuring the correct understanding of laws and oaths. In Africa, Libyco-Berber and Punic were used in inscriptions into the 2nd century. In Syria, Palmyrene soldiers used their dialect of Aramaic for inscriptions, an exception to the rule that Latin was the language of the military. The last reference to Gaulish was between 560 and 575. The emergent Gallo-Romance languages would then be shaped by Gaulish. Proto-Basque or Aquitanian evolved with Latin loan words to modern Basque. The Thracian language, as were several now-extinct languages in Anatolia, are attested in Imperial-era inscriptions.
 
 
 == Society ==
 
 The Empire was multicultural, with "astonishing cohesive capacity" to create shared identity while encompassing diverse peoples. Public monuments and communal spaces open to all—such as forums, amphitheatres, racetracks and baths—helped foster a sense of "Romanness".
 Roman society had multiple, overlapping social hierarchies. The civil war preceding Augustus caused upheaval, but did not effect an immediate redistribution of wealth and social power. From the perspective of the lower classes, a peak was merely added to the social pyramid. Personal relationships—patronage, friendship (amicitia), family, marriage—continued to influence politics. By the time of Nero, however, it was not unusual to find a former slave who was richer than a freeborn citizen, or an equestrian who exercised greater power than a senator.
 The blurring of the Republic's more rigid hierarchies led to increased social mobility, both upward and downward, to a greater extent than all other well-documented ancient societies. Women, freedmen, and slaves had opportunities to profit and exercise influence in ways previously less available to them. Social life, particularly for those whose personal resources were limited, was further fostered by a proliferation of voluntary associations and confraternities (collegia and sodalitates): professional and trade guilds, veterans' groups, religious sodalities, drinking and dining clubs, performing troupes, and burial societies.
 
 
 === Legal status ===
 
 According to the jurist Gaius, the essential distinction in the Roman "law of persons" was that all humans were either free (liberi) or slaves (servi). The legal status of free persons was further defined by their citizenship. Most citizens held limited rights (such as the ius Latinum, "Latin right"), but were entitled to legal protections and privileges not enjoyed by non-citizens. Free people not considered citizens, but living within the Roman world, were peregrini, non-Romans. In 212, the Constitutio Antoniniana extended citizenship to all freeborn inhabitants of the empire. This legal egalitarianism required a far-reaching revision of existing laws that distinguished between citizens and non-citizens.
 
 
 ==== Women in Roman law ====
 
 Freeborn Roman women were considered citizens, but did not vote, hold political office, or serve in the military. A mother's citizen status determined that of her children, as indicated by the phrase ex duobus civibus Romanis natos ("children born of two Roman citizens"). A Roman woman kept her own family name (nomen) for life. Children most often took the father's name, with some exceptions. Women could own property, enter contracts, and engage in business. Inscriptions throughout the Empire honour women as benefactors in funding public works, an indication they could hold considerable fortunes.
 The archaic manus marriage in which the woman was subject to her husband's authority was largely abandoned by the Imperial era, and a married woman retained ownership of any property she brought into the marriage. Technically she remained under her father's legal authority, even though she moved into her husband's home, but when her father died she became legally emancipated. This arrangement was a factor in the degree of independence Roman women enjoyed compared to many other cultures up to the modern period: although she had to answer to her father in legal matters, she was free of his direct scrutiny in daily life, and her husband had no legal power over her. Although it was a point of pride to be a "one-man woman" (univira) who had married only once, there was little stigma attached to divorce, nor to speedy remarriage after being widowed or divorced. Girls had equal inheritance rights with boys if their father died without leaving a will. A mother's right to own and dispose of property, including setting the terms of her will, gave her enormous influence over her sons into adulthood.
 
 As part of the Augustan programme to restore traditional morality and social order, moral legislation attempted to regulate conduct as a means of promoting "family values". Adultery was criminalized, and defined broadly as an illicit sex act (stuprum) between a male citizen and a married woman, or between a married woman and any man other than her husband. That is, a double standard was in place: a married woman could have sex only with her husband, but a married man did not commit adultery if he had sex with a prostitute or person of marginalized status. Childbearing was encouraged: a woman who had given birth to three children was granted symbolic honours and greater legal freedom (the ius trium liberorum).
 
 
 ==== Slaves and the law ====
 
 At the time of Augustus, as many as 35% of the people in Roman Italy were slaves, making Rome one of five historical "slave societies" in which slaves constituted at least a fifth of the population and played a major role in the economy. In urban settings, slaves might be professionals such as teachers, physicians, chefs, and accountants; the majority of slaves provided trained or unskilled labour. Agriculture and industry, such as milling and mining, relied on the exploitation of slaves. Outside Italy, slaves were on average an estimated 10 to 20% of the population, sparse in Roman Egypt but more concentrated in some Greek areas. Expanding Roman ownership of arable land and industries affected preexisting practices of slavery in the provinces. Although slavery has often been regarded as waning in the 3rd and 4th centuries, it remained an integral part of Roman society until gradually ceasing in the 6th and 7th centuries with the disintegration of the complex Imperial economy.
 
 Laws pertaining to slavery were "extremely intricate". Slaves were considered property and had no legal personhood. They could be subjected to forms of corporal punishment not normally exercised on citizens, sexual exploitation, torture, and summary execution. A slave could not as a matter of law be raped; a slave's rapist had to be prosecuted by the owner for property damage under the Aquilian Law. Slaves had no right to the form of legal marriage called conubium, but their unions were sometimes recognized. Technically, a slave could not own property, but a slave who conducted business might be given access to an individual fund (peculium) that he could use, depending on the degree of trust and co-operation between owner and slave. Within a household or workplace, a hierarchy of slaves might exist, with one slave acting as the master of others. Talented slaves might accumulate a large enough peculium to justify their freedom, or be manumitted for services rendered. Manumission had become frequent enough that in 2 BC a law (Lex Fufia Caninia) limited the number of slaves an owner was allowed to free in his will.
 Following the Servile Wars of the Republic, legislation under Augustus and his successors shows a driving concern for controlling the threat of rebellions through limiting the size of work groups, and for hunting down fugitive slaves. Over time slaves gained increased legal protection, including the right to file complaints against their masters. A bill of sale might contain a clause stipulating that the slave could not be employed for prostitution, as prostitutes in ancient Rome were often slaves. The burgeoning trade in eunuchs in the late 1st century prompted legislation that prohibited the castration of a slave against his will "for lust or gain".
 Roman slavery was not based on race. Generally, slaves in Italy were indigenous Italians, with a minority of foreigners (including both slaves and freedmen) estimated at 5% of the total in the capital at its peak, where their number was largest. Foreign slaves had higher mortality and lower birth rates than natives and were sometimes even subjected to mass expulsions. The average recorded age at death for the slaves of the city of Rome was seventeen and a half years (17.2 for males; 17.9 for females).
 During the period of republican expansionism when slavery had become pervasive, war captives were a main source of slaves. The range of ethnicities among slaves to some extent reflected that of the armies Rome defeated in war, and the conquest of Greece brought a number of highly skilled and educated slaves. Slaves were also traded in markets and sometimes sold by pirates. Infant abandonment and self-enslavement among the poor were other sources. Vernae, by contrast, were "homegrown" slaves born to female slaves within the household, estate or farm. Although they had no special legal status, an owner who mistreated or failed to care for his vernae faced social disapproval, as they were considered part of the family household and in some cases might actually be the children of free males in the family.
 
 
 ==== Freedmen ====
 
 Rome differed from Greek city-states in allowing freed slaves to become citizens; any future children of a freedman were born free, with full rights of citizenship. After manumission, a slave who had belonged to a Roman citizen enjoyed active political freedom (libertas), including the right to vote. His former master became his patron (patronus): the two continued to have customary and legal obligations to each other. During the early Empire, freedmen held key positions in the government bureaucracy, so much so that Hadrian limited their participation by law. The rise of successful freedmen—through political influence or wealth—is a characteristic of early Imperial society. The prosperity of a high-achieving group of freedmen is attested by inscriptions throughout the Empire.
 
 
 === Census rank ===
 
 The Latin word ordo (plural ordines) is translated variously and inexactly into English as "class, order, rank". One purpose of the Roman census was to determine the ordo to which an individual belonged. Two of the highest ordines in Rome were the senatorial and equestrian. Outside Rome, cities or colonies were led by decurions, also known as curiales.
 
 "Senator" was not itself an elected office in ancient Rome; an individual gained admission to the Senate after he had been elected to and served at least one term as an executive magistrate. A senator also had to meet a minimum property requirement of 1 million sestertii. Not all men who qualified for the ordo senatorius chose to take a Senate seat, which required legal domicile at Rome. Emperors often filled vacancies in the 600-member body by appointment. A senator's son belonged to the ordo senatorius, but he had to qualify on his own merits for admission to the Senate. A senator could be removed for violating moral standards.
 In the time of Nero, senators were still primarily from Italy, with some from the Iberian peninsula and southern France; men from the Greek-speaking provinces of the East began to be added under Vespasian. The first senator from the easternmost province, Cappadocia, was admitted under Marcus Aurelius. By the Severan dynasty (193–235), Italians made up less than half the Senate. During the 3rd century, domicile at Rome became impractical, and inscriptions attest to senators who were active in politics and munificence in their homeland (patria).
 Senators were the traditional governing class who rose through the cursus honorum, the political career track, but equestrians often possessed greater wealth and political power. Membership in the equestrian order was based on property; in Rome's early days, equites or knights had been distinguished by their ability to serve as mounted warriors, but cavalry service was a separate function in the Empire. A census valuation of 400,000 sesterces and three generations of free birth qualified a man as an equestrian. The census of 28 BC uncovered large numbers of men who qualified, and in 14 AD, a thousand equestrians were registered at Cádiz and Padua alone. Equestrians rose through a military career track (tres militiae) to become highly placed prefects and procurators within the Imperial administration.
 The rise of provincial men to the senatorial and equestrian orders is an aspect of social mobility in the early Empire. Roman aristocracy was based on competition, and unlike later European nobility, a Roman family could not maintain its position merely through hereditary succession or having title to lands. Admission to the higher ordines brought distinction and privileges, but also responsibilities. In antiquity, a city depended on its leading citizens to fund public works, events, and services (munera). Maintaining one's rank required massive personal expenditures. Decurions were so vital for the functioning of cities that in the later Empire, as the ranks of the town councils became depleted, those who had risen to the Senate were encouraged to return to their hometowns, in an effort to sustain civic life.
 In the later Empire, the dignitas ("worth, esteem") that attended on senatorial or equestrian rank was refined further with titles such as vir illustris ("illustrious man"). The appellation clarissimus (Greek lamprotatos) was used to designate the dignitas of certain senators and their immediate family, including women. "Grades" of equestrian status proliferated.
 
 
 ==== Unequal justice ====
 
 As the republican principle of citizens' equality under the law faded, the symbolic and social privileges of the upper classes led to an informal division of Roman society into those who had acquired greater honours (honestiores) and humbler folk (humiliores). In general, honestiores were the members of the three higher "orders", along with certain military officers. The granting of universal citizenship in 212 seems to have increased the competitive urge among the upper classes to have their superiority affirmed, particularly within the justice system. Sentencing depended on the judgment of the presiding official as to the relative "worth" (dignitas) of the defendant: an honestior could pay a fine for a crime for which an humilior might receive a scourging.
 Execution, which was an infrequent legal penalty for free men under the Republic, could be quick and relatively painless for honestiores, while humiliores might suffer the kinds of torturous death previously reserved for slaves, such as crucifixion and condemnation to the beasts. In the early Empire, those who converted to Christianity could lose their standing as honestiores, especially if they declined to fulfil religious responsibilities, and thus became subject to punishments that created the conditions of martyrdom.
 
 
 == Government and military ==
 
 The three major elements of the Imperial state were the central government, the military, and the provincial government. The military established control of a territory through war, but after a city or people was brought under treaty, the mission turned to policing: protecting Roman citizens, agricultural fields, and religious sites. The Romans lacked sufficient manpower or resources to rule through force alone. Cooperation with local elites was necessary to maintain order, collect information, and extract revenue. The Romans often exploited internal political divisions.
 Communities with demonstrated loyalty to Rome retained their own laws, could collect their own taxes locally, and in exceptional cases were exempt from Roman taxation. Legal privileges and relative independence incentivized compliance. Roman government was thus limited, but efficient in its use of available resources.
 
 
 === Central government ===
 
 The Imperial cult of ancient Rome identified emperors and some members of their families with divinely sanctioned authority (auctoritas). The rite of apotheosis (also called consecratio) signified the deceased emperor's deification. The dominance of the emperor was based on the consolidation of powers from several republican offices. The emperor made himself the central religious authority as pontifex maximus, and centralized the right to declare war, ratify treaties, and negotiate with foreign leaders. While these functions were clearly defined during the Principate, the emperor's powers over time became less constitutional and more monarchical, culminating in the Dominate.
 The emperor was the ultimate authority in policy- and decision-making, but in the early Principate, he was expected to be accessible and deal personally with official business and petitions. A bureaucracy formed around him only gradually. The Julio-Claudian emperors relied on an informal body of advisors that included not only senators and equestrians, but trusted slaves and freedmen. After Nero, the influence of the latter was regarded with suspicion, and the emperor's council (consilium) became subject to official appointment for greater transparency. Though the Senate took a lead in policy discussions until the end of the Antonine dynasty, equestrians played an increasingly important role in the consilium. The women of the emperor's family often intervened directly in his decisions.
 Access to the emperor might be gained at the daily reception (salutatio), a development of the traditional homage a client paid to his patron; public banquets hosted at the palace; and religious ceremonies. The common people who lacked this access could manifest their approval or displeasure as a group at games. By the 4th century, the Christian emperors became remote figureheads who issued general rulings, no longer responding to individual petitions. Although the Senate could do little short of assassination and open rebellion to contravene the will of the emperor, it retained its symbolic political centrality. The Senate legitimated the emperor's rule, and the emperor employed senators as legates (legati): generals, diplomats, and administrators.
 The practical source of an emperor's power and authority was the military. The legionaries were paid by the Imperial treasury, and swore an annual oath of loyalty to the emperor. Most emperors chose a successor, usually a close family member or adopted heir. The new emperor had to seek a swift acknowledgement of his status and authority to stabilize the political landscape. No emperor could hope to survive without the allegiance of the Praetorian Guard and the legions. To secure their loyalty, several emperors paid the donativum, a monetary reward. In theory, the Senate was entitled to choose the new emperor, but did so mindful of acclamation by the army or Praetorians.
 
 
 === Military ===
 
 After the Punic Wars, the Roman army comprised professional soldiers who volunteered for 20 years of active duty and five as reserves. The transition to a professional military began during the late Republic and was one of the many profound shifts away from republicanism, under which an army of conscript citizens defended the homeland against a specific threat. The Romans expanded their war machine by "organizing the communities that they conquered in Italy into a system that generated huge reservoirs of manpower for their army". By Imperial times, military service was a full-time career. The pervasiveness of military garrisons throughout the Empire was a major influence in the process of Romanization.
 The primary mission of the military of the early empire was to preserve the Pax Romana. The three major divisions of the military were:
 
 the garrison at Rome, comprising the Praetorian Guard, the cohortes urbanae and the vigiles, who functioned as police and firefighters;
 the provincial army, comprising the Roman legions and the auxiliaries provided by the provinces (auxilia);
 the navy.
 
 Through his military reforms, which included consolidating or disbanding units of questionable loyalty, Augustus regularized the legion. A legion was organized into ten cohorts, each of which comprised six centuries, with a century further made up of ten squads (contubernia); the exact size of the Imperial legion, which was likely determined by logistics, has been estimated to range from 4,800 to 5,280. After Germanic tribes wiped out three legions in the Battle of the Teutoburg Forest in 9 AD, the number of legions was increased from 25 to around 30. The army had about 300,000 soldiers in the 1st century, and under 400,000 in the 2nd, "significantly smaller" than the collective armed forces of the conquered territories. No more than 2% of adult males living in the Empire served in the Imperial army. Augustus also created the Praetorian Guard: nine cohorts, ostensibly to maintain the public peace, which were garrisoned in Italy. Better paid than the legionaries, the Praetorians served only sixteen years.
 The auxilia were recruited from among the non-citizens. Organized in smaller units of roughly cohort strength, they were paid less than the legionaries, and after 25 years of service were rewarded with Roman citizenship, also extended to their sons. According to Tacitus there were roughly as many auxiliaries as there were legionaries—thus, around 125,000 men, implying approximately 250 auxiliary regiments. The Roman cavalry of the earliest Empire were primarily from Celtic, Hispanic or Germanic areas. Several aspects of training and equipment derived from the Celts.
 The Roman navy not only aided in the supply and transport of the legions but also in the protection of the frontiers along the rivers Rhine and Danube. Another duty was protecting maritime trade against pirates. It patrolled the Mediterranean, parts of the North Atlantic coasts, and the Black Sea. Nevertheless, the army was considered the senior and more prestigious branch.
 
 
 === Provincial government ===
 An annexed territory became a Roman province in three steps: making a register of cities, taking a census, and surveying the land. Further government recordkeeping included births and deaths, real estate transactions, taxes, and juridical proceedings. In the 1st and 2nd centuries, the central government sent out around 160 officials annually to govern outside Italy. Among these officials were the Roman governors: magistrates elected at Rome who in the name of the Roman people governed senatorial provinces; or governors, usually of equestrian rank, who held their imperium on behalf of the emperor in imperial provinces, most notably Roman Egypt. A governor had to make himself accessible to the people he governed, but he could delegate various duties. His staff, however, was minimal: his official attendants (apparitores), including lictors, heralds, messengers, scribes, and bodyguards; legates, both civil and military, usually of equestrian rank; and friends who accompanied him unofficially.
 Other officials were appointed as supervisors of government finances. Separating fiscal responsibility from justice and administration was a reform of the Imperial era, to avoid provincial governors and tax farmers exploiting local populations for personal gain. Equestrian procurators, whose authority was originally "extra-judicial and extra-constitutional", managed both state-owned property and the personal property of the emperor (res privata). Because Roman government officials were few, a provincial who needed help with a legal dispute or criminal case might seek out any Roman perceived to have some official capacity.
 In the High Empire, Italy was legally distinguished from the provinces, and along with some favored provincial communities, enjoyed immunity from the property tax and poll tax. However, under the Emperor Diocletian, Italy lost these privileges and was subdivided into provinces.
 
 
 === Law ===
 
 Roman courts held original jurisdiction over cases involving Roman citizens throughout the empire, but there were too few judicial functionaries to impose Roman law uniformly in the provinces. Most parts of the Eastern Empire already had well-established law codes and juridical procedures. Generally, it was Roman policy to respect the mos regionis ("regional tradition" or "law of the land") and to regard local laws as a source of legal precedent and social stability. The compatibility of Roman and local law was thought to reflect an underlying ius gentium, the "law of nations" or international law regarded as common and customary. If provincial law conflicted with Roman law or custom, Roman courts heard appeals, and the emperor held final decision-making authority.
 In the West, law had been administered on a highly localized or tribal basis, and private property rights may have been a novelty of the Roman era, particularly among Celts. Roman law facilitated the acquisition of wealth by a pro-Roman elite. The extension of universal citizenship to all free inhabitants of the Empire in 212 required the uniform application of Roman law, replacing local law codes that had applied to non-citizens. Diocletian's efforts to stabilize the Empire after the Crisis of the Third Century included two major compilations of law in four years, the Codex Gregorianus and the Codex Hermogenianus, to guide provincial administrators in setting consistent legal standards.
 The pervasiveness of Roman law throughout Western Europe enormously influenced the Western legal tradition, reflected by continued use of Latin legal terminology in modern law.
 
 
 === Taxation ===
 
 Taxation under the Empire amounted to about 5% of its gross product. The typical tax rate for individuals ranged from 2 to 5%. The tax code was "bewildering" in its complicated system of direct and indirect taxes, some paid in cash and some in kind. Taxes might be specific to a province, or kinds of properties such as fisheries; they might be temporary. Tax collection was justified by the need to maintain the military, and taxpayers sometimes got a refund if the army captured a surplus of booty. In-kind taxes were accepted from less-monetized areas, particularly those who could supply grain or goods to army camps.
 The primary source of direct tax revenue was individuals, who paid a poll tax and a tax on their land, construed as a tax on its produce or productive capacity. Tax obligations were determined by the census: each head of household provided a headcount of his household, as well as an accounting of his property. A major source of indirect-tax revenue was the portoria, customs and tolls on trade, including among provinces. Towards the end of his reign, Augustus instituted a 4% tax on the sale of slaves, which Nero shifted from the purchaser to the dealers, who responded by raising their prices. An owner who manumitted a slave paid a "freedom tax", calculated at 5% of value. An inheritance tax of 5% was assessed when Roman citizens above a certain net worth left property to anyone outside their immediate family. Revenues from the estate tax and from an auction tax went towards the veterans' pension fund (aerarium militare).
 Low taxes helped the Roman aristocracy increase their wealth, which equalled or exceeded the revenues of the central government. An emperor sometimes replenished his treasury by confiscating the estates of the "super-rich", but in the later period, the resistance of the wealthy to paying taxes was one of the factors contributing to the collapse of the Empire.
 
 
 == Economy ==
 
 The Empire is best thought of as a network of regional economies, based on a form of "political capitalism" in which the state regulated commerce to assure its own revenues. Economic growth, though not comparable to modern economies, was greater than that of most other societies prior to industrialization. Territorial conquests permitted a large-scale reorganization of land use that resulted in agricultural surplus and specialization, particularly in north Africa. Some cities were known for particular industries. The scale of urban building indicates a significant construction industry. Papyri preserve complex accounting methods that suggest elements of economic rationalism, and the Empire was highly monetized. Although the means of communication and transport were limited in antiquity, transportation in the 1st and 2nd centuries expanded greatly, and trade routes connected regional economies. The supply contracts for the army drew on local suppliers near the base (castrum), throughout the province, and across provincial borders.
 Economic historians vary in their calculations of the gross domestic product during the Principate. In the sample years of 14, 100, and 150 AD, estimates of per capita GDP range from 166 to 380 HS. The GDP per capita of Italy is estimated as 40 to 66% higher than in the rest of the Empire, due to tax transfers from the provinces and the concentration of elite income.
 Economic dynamism resulted in social mobility. Although aristocratic values permeated traditional elite society, wealth requirements for rank indicate a strong tendency towards plutocracy. Prestige could be obtained through investing one's wealth in grand estates or townhouses, luxury items, public entertainments, funerary monuments, and religious dedications. Guilds (collegia) and corporations (corpora) provided support for individuals to succeed through networking. "There can be little doubt that the lower classes of ... provincial towns of the Roman Empire enjoyed a high standard of living not equaled again in Western Europe until the 19th century". Households in the top 1.5% of income distribution captured about 20% of income. The "vast majority" produced more than half of the total income, but lived near subsistence.
 
 
 === Currency and banking ===
 
 The early Empire was monetized to a near-universal extent, using money to state prices and debts. Augustus established a practical three-tier currency system that Romans used in their daily lives: gold coins (aureus) for major purchases and wealth storage, silver coins (denarius) that workers earned and used to pay taxes, and bronze/brass coins, especially the brass sestertius and dupondius, along with the copper as and smaller denominations, that people used for everyday shopping and small transactions. Most accounts, rents, and public fees were reckoned in sesterces (HS), even when payment arrived as denarii, aurei, or the bronze pieces converted at the fixed ratios of one aureus to twenty-five denarii, one denarius to four sesterces, and one sesterce to four asses. Because the bronzes circulated by face value rather than metal content, Romans in the first and second centuries counted coins rather than weighing them, and bullion or ingots were rarely treated as pecunia ("money") outside frontier contexts. This reliance on token bronzes underpinned the fiduciary character of Roman coinage and contributed to the debasement of the silver denominations in the later Empire, even as standardized money promoted trade, market integration, and a substantial money supply for commerce and saving.
 Rome had no central bank, and regulation of the banking system was minimal. Banks of classical antiquity typically kept less in reserves than the full total of customers' deposits. A typical bank had fairly limited capital, and often only one principal. Seneca assumes that anyone involved in Roman commerce needs access to credit. A professional deposit banker received and held deposits for a fixed or indefinite term, and lent money to third parties. The senatorial elite were involved heavily in private lending, both as creditors and borrowers. The holder of a debt could use it as a means of payment by transferring it to another party, without cash changing hands. Although it has sometimes been thought that ancient Rome lacked documentary transactions, the system of banks throughout the Empire permitted the exchange of large sums without physically transferring coins, in part because of the risks of moving large amounts of cash. Only one serious credit shortage is known to have occurred in the early Empire, in 33 AD; generally, available capital exceeded the amount needed by borrowers. The central government itself did not borrow money, and without public debt had to fund deficits from cash reserves.
 Emperors of the Antonine and Severan dynasties debased the currency, particularly the denarius, under the pressures of meeting military payrolls. Sudden inflation under Commodus damaged the credit market. In the mid-200s, the supply of specie contracted sharply. Conditions during the Crisis of the Third Century—such as reductions in long-distance trade, disruption of mining operations, and the physical transfer of gold coinage outside the empire by invading enemies—greatly diminished the money supply and the banking sector. Although Roman coinage had long been fiat money or fiduciary currency, general economic anxieties came to a head under Aurelian, and bankers lost confidence in coins. Despite Diocletian's introduction of the gold solidus and monetary reforms, the credit market of the Empire never recovered its former robustness.
 
 
 === Mining and metallurgy ===
 
 The main mining regions of the Empire were the Iberian Peninsula (silver, copper, lead, iron and gold); Gaul (gold, silver, iron); Britain (mainly iron, lead, tin), the Danubian provinces (gold, iron); Macedonia and Thrace (gold, silver); and Asia Minor (gold, silver, iron, tin). Intensive large-scale mining—of alluvial deposits, and by means of open-cast mining and underground mining—took place from the reign of Augustus up to the early 3rd century, when the instability of the Empire disrupted production.
 Hydraulic mining allowed base and precious metals to be extracted on a proto-industrial scale. The total annual iron output is estimated at 82,500 tonnes. Copper and lead production levels were unmatched until the Industrial Revolution. At its peak around the mid-2nd century, the Roman silver stock is estimated at 10,000 t, five to ten times larger than the combined silver mass of medieval Europe and the Caliphate around 800 AD. As an indication of the scale of Roman metal production, lead pollution in the Greenland ice sheet quadrupled over prehistoric levels during the Imperial era and dropped thereafter.
 
 
 === Transportation and communication ===
 
 The Empire completely encircled the Mediterranean, which they called "our sea" (Mare Nostrum). Roman sailing vesse