Guide · Historical timeline
A visual history of the Roman Empire
Rome went from a hilltop village to the largest political unit the western world had ever seen, then split, contracted and endured for another millennium as Byzantium. This guide walks the timeline — and every milestone below jumps the 3D globe to that exact year so you can see the borders move.
Timeline
Founding of Rome
753 BCTraditional date of Rome's founding by Romulus. A cluster of villages on the Tiber becomes a kingdom that will outlast every neighbor.
Open on the globe →Birth of the Republic
509 BCThe last king is expelled and Rome becomes a res publica governed by consuls, senate and assemblies — the political frame that carries it through the next four centuries of conquest.
Open on the globe →Punic Wars begin
264 BCRome and Carthage collide over Sicily. Three wars later Carthage is razed, and Rome's territory jumps from the Italian peninsula to the whole western Mediterranean.
Open on the globe →Caesar crosses the Rubicon
49 BCCivil war ends the Republic in everything but name. Julius Caesar's march on Rome opens the door for one-man rule.
Open on the globe →Augustus and the Empire
27 BCOctavian takes the title Augustus. The Roman Empire is founded and the Pax Romana begins: two centuries of relative peace and unprecedented urbanisation.
Open on the globe →Territorial peak under Trajan
117 ADRome reaches its greatest extent — from Scotland to Mesopotamia, from Morocco to the Caspian. Roughly 5 million km² and 60+ million people under one administration.
Open on the globe →Citizenship for all free men
212 ADThe Constitutio Antoniniana grants Roman citizenship to every free inhabitant of the empire — a legal unification without parallel in the ancient world.
Open on the globe →Diocletian's Tetrarchy
285 ADThe empire is too big to rule from one throne. Diocletian splits administration between East and West, foreshadowing the permanent division a century later.
Open on the globe →New capital at Constantinople
330 ADConstantine refounds Byzantium as Nova Roma. The centre of gravity shifts east and the empire's second life begins.
Open on the globe →Permanent East–West split
395 ADOn Theodosius I's death the empire splits for good between his sons. Two governments, two courts, two very different futures.
Open on the globe →Fall of the Western Empire
476 ADOdoacer deposes the last western emperor Romulus Augustulus. The West fragments into Germanic kingdoms; the East, unbroken, will call itself Roman for another thousand years.
Open on the globe →Fall of Constantinople
1453 ADThe Ottoman conquest ends the Eastern Roman (Byzantine) Empire — and, formally, the Roman state that began with Augustus 1,480 years earlier.
Open on the globe →
How to read the map
Chronos renders historical borders from the cShapes 2.0 dataset alongside a curated layer of ancient polities. When you jump to 117 AD you're seeing the empire at Trajan's death, stretching from Roman Britain to Mesopotamia. Slide backwards to 27 BC and the eastern provinces are still a patchwork of client kingdoms; slide forward to 395 AD and the map cracks in two along the line Theodosius drew between his sons.
Sources: cShapes 2.0 (Schvitz et al. 2022), Natural Earth, and Wikipedia entries on the Roman Republic, Principate, Dominate and Byzantine Empire. See our licenses page for full attributions.