Roman Empire
The Roman Empire was the imperial state that grew from Rome’s republican system into a Mediterranean-wide power. Beginning conventionally with Augustus in 27 BCE, it linked diverse provinces through imperial government, armies, trade, and shared institutions while local cultures persisted. The western imperial office ended in the fifth century CE, but Roman rule continued in the East for more than a millennium.
From republic to imperial rule
The Roman Empire emerged from the Roman Republic’s expansion and a long period of political conflict. In 27 BCE the Senate granted Octavian the honorific title Augustus, a date commonly used to mark the beginning of imperial rule. The settlement did not immediately abolish republican offices: the Senate and magistracies continued, but authority became increasingly concentrated in the emperor. Augustus’ Res Gestae presents his rule as a transfer of power back to the Senate and Roman people. Read as a political self-description rather than a neutral constitutional account, it contrasts with the growing imperial control described by historians. The form of government changed over time as rulers reorganized administration and authority.
An empire of provinces
At its greatest extent under Trajan in the early second century CE, Roman territory surrounded the Mediterranean and reached from Britain and western Europe through North Africa to the Near East. The provinces were connected by imperial administration, military deployments, roads, and trade, but they were not culturally uniform. Local languages, religious practices, and artistic traditions continued, interacting with Roman customs and institutions in different ways from region to region. Roman citizenship also expanded over the imperial period, changing the legal and political relationship between Rome and many provincial communities.
Society and unequal status
Roman society contained sharp differences in legal status, wealth, and political influence. Slavery was a major institution: enslaved people lived and worked in towns, households, businesses, and the countryside, and Roman law treated them as property. Their experiences varied, and some people gained freedom, but surviving records often reflect the interests of owners and the lives of those able to leave inscriptions or monuments. The empire’s history therefore includes both the integration of provincial communities and systems of coercion and inequality.
Division and historical legacy
Late Roman emperors introduced major administrative and military reforms. After Theodosius I died in 395 CE, his sons ruled the western and eastern portions under separate imperial courts. The deposition of Romulus Augustulus in 476 is conventionally treated as the end of the Western Roman Empire, not the end of Roman government everywhere. The Eastern Roman state continued, with Constantinople as its capital, until the Ottoman conquest in 1453; historians commonly call its later history Byzantine. Roman law, political vocabulary, urban design, and infrastructure influenced later societies, while the empire’s provincial cultures and eastern continuation complicate any single account of its legacy.
Key facts
- Conventional beginning
- The imperial period is commonly dated from 27 BCE, when Octavian received the title Augustus.
- Geographic reach
- At its greatest extent under Trajan, Roman territory encircled the Mediterranean and stretched into Europe, North Africa, and the Near East.
- Government
- Republican institutions continued under Augustus, while political authority became increasingly concentrated in the emperor.
- Western empire
- The year 476 CE is conventionally used for the end of the Western Roman Empire.
- Eastern continuation
- The Eastern Roman state continued until the Ottoman conquest of Constantinople in 1453.
- Provincial cultures
- Imperial institutions connected diverse provinces, but local languages, religions, and customs persisted.
Timeline
27 BCE
The Senate grants Octavian the title Augustus; this is commonly used as the start of the Roman imperial period.
117 CE
The empire reaches its greatest territorial extent under Trajan.
395 CE
After Theodosius I’s death, the empire is governed under separate western and eastern imperial courts.
476 CE
Romulus Augustulus is deposed, conventionally marking the end of the Western Roman Empire.
1453 CE
The Ottoman conquest of Constantinople ends the Eastern Roman state, known to modern historians as the Byzantine Empire.
Ask about this article
Answers use only “Roman Empire” and its references, with citations.
References
- 1.Roman Empire Definition, History, Time Period, Map, & Facts
Encyclopaedia Britannica · other · reliability: high · retrieved 18 October 2026
Supports: Reference overview of the empire’s conventional chronology, territorial extent, political development, western decline, and legacy.
- 2.The Roman Empire (27 B.C.–393 A.D.)
The Metropolitan Museum of Art · other · reliability: high · retrieved 18 October 2026
Supports: Overview of imperial chronology, Augustus and republican institutions, provincial administration, and the later division of the empire.
- 3.Art of the Roman Provinces, 1–500 CE
The Metropolitan Museum of Art · other · reliability: high · retrieved 18 October 2026
Supports: Evidence for cultural interaction, regional traditions, citizenship, and artistic life across Roman provinces.
- 4.Roman in the Provinces: Art on the Periphery of Empire
Yale University Art Gallery · other · reliability: high · retrieved 18 October 2026
Supports: Museum exhibition overview describing the diversity of provincial communities and the interaction of local traditions with Roman imperial culture.
- 5.Slavery in ancient Rome
The British Museum · other · reliability: high · retrieved 18 October 2026
Supports: Museum-based account of slavery’s role in Roman society, enslaved people’s varied lives, and the evidence surviving in objects and inscriptions.
- 6.The Deeds of the Divine Augustus, 34
Lexundria; Shipley translation of Augustus’ Res Gestae · other · reliability: high · retrieved 18 October 2026
Supports: Primary-source statement in which Augustus describes his transfer of power to the Senate and Roman people; treated in the article as his political self-presentation.
- 7.Byzantine Empire History, Geography, Maps, & Facts
Encyclopaedia Britannica · other · reliability: high · retrieved 18 October 2026
Supports: Reference account of the Eastern Roman state’s continuation and later Byzantine history through 1453.
- 8.Roman law Influence, Importance, Principles, & Facts
Encyclopaedia Britannica · other · reliability: high · retrieved 18 October 2026
Supports: Reference overview of Roman law’s historical development and later influence.
References are suggested by the research engine and may be incomplete. Unverified URLs are omitted rather than guessed.
Article history
- Version 218 October 2026 · EditorUpdated by Zapia
- Version 118 October 2026 · EditorCreated by Zapia