History › Classical age
Roman Empire
27 BC – AD 476 in the West; the East lasted to 1453· Empire, kingdom or state· Europe
Well documentedSolid records, physical evidence or scientific consensus.
The state that ruled the Mediterranean world and much of Europe under emperors from 27 BC; its western half fell in 476.
See it on the History map →What happened
After Caesar's murder, his adopted heir Octavian won the civil wars and in 27 BC took the name Augustus, keeping republican forms while holding real power. About two centuries of relative peace, the Pax Romana, followed. At its peak around AD 117 the empire covered about 5 million square kilometers and perhaps 50–70 million people; estimates vary. Roads, aqueducts, Roman law, and Latin and Greek tied it together. From 395 it was permanently split into eastern and western halves.
Why it matters
Roman law, Latin, city planning, Christianity's spread and the idea of one universal state shaped Europe and the Mediterranean for the next 1,500 years.
Think of it like
Augustus kept the Republic's storefront (Senate, consuls and elections) while holding the controlling interest, like a managing partner with all the votes.
How we know
Historians such as Tacitus and Cassius Dio, tens of thousands of inscriptions, coins, ruins on three continents, and papyrus documents from Egypt.
Inside this (5)
Connections (6)
▸Silk Road linked China, indirectly, with Roman EmpireWell documented
The connection
By the 1st century AD, Chinese silk reached Rome through Parthian, Kushan and Indian middlemen, and by sea via Indian and Red Sea ports. Wealthy Romans paid heavily; Pliny the Elder complained that India, China and Arabia drained 100 million sesterces a year from the empire. Neither empire knew the other well, and direct contact was rare.
When and how
Routes via Persia, India and the Red Sea, 1st century BC to 3rd century AD; Chinese records report a 'Roman' embassy in AD 166.
How we know
Chinese silk found at Roman-era Palmyra, Pliny's complaint, hoards of Roman coins in India, and Chinese descriptions of 'Daqin', their name for Rome.
Debates and open questions
The AD 166 'embassy' may have been private merchants; how much each empire really knew of the other remains debated.
▸Roman Republic became Roman EmpireWell documented
The connection
Rome's republic of annual magistrates, a Senate and assemblies was built for a city-state. As Rome conquered the Mediterranean, generals with loyal armies and vast wealth outgrew it, and a century of civil wars followed. In 27 BC the Senate granted Octavian the title Augustus; republican offices continued, but one man now held real power.
When and how
Rome, 133–27 BC; the Gracchi brothers, Marius, Sulla, Pompey, Caesar, Mark Antony and Octavian.
How we know
Writings of Cicero, Sallust and later historians, Augustus' own account of his deeds (the Res Gestae), and coins.
Debates and open questions
When the Republic really ended (49, 44, 31 or 27 BC), and whether its fall was inevitable, are debated.
▸Julius Caesar paved the way for Roman EmpireWell documented
The connection
Caesar's will adopted his 18-year-old grandnephew Octavian as son and heir. Using Caesar's name, money and veterans, Octavian beat the assassins at Philippi (42 BC) and then Mark Antony and Cleopatra at Actium (31 BC). As Augustus he became the first emperor, avoiding Caesar's mistake of flaunting power. Later rulers took 'Caesar' as a title.
When and how
Rome, Philippi and Actium, 44–27 BC; Octavian, Mark Antony, Cleopatra, Brutus and Cassius.
How we know
Ancient historians such as Suetonius and Cassius Dio, Augustus' Res Gestae, and coins honoring the 'Divine Julius'.
Debates and open questions
How far Caesar intended a monarchy, and whether he meant Octavian as a political successor, are unknown.
▸Roman Empire persecuted, then adopted ChristianityWell documented
The connection
For nearly three centuries Rome treated Christians as suspect for refusing to honor the emperor and the gods. Persecutions were local and occasional, then empire-wide under Decius (250) and Diocletian (303–311). Constantine legalized Christianity in 313, and in 380 Theodosius made it the state religion. Roman roads, cities and common languages helped it spread.
When and how
Across the empire, from Nero's persecution in Rome (AD 64) to Theodosius' Edict of Thessalonica (380).
How we know
Roman writers Tacitus and Pliny, imperial edicts, Christian martyr accounts and church histories.
Debates and open questions
How many Christians were killed is uncertain, with estimates in the thousands; early Christian writers may have exaggerated the scale.
▸Jesus of Nazareth was crucified under Roman EmpireWell documented
The connection
Judea was under Roman control, run by a prefect. Crucifixion was a Roman punishment for rebels and slaves. Jesus was arrested in Jerusalem at Passover, handed over by temple authorities to the prefect Pontius Pilate, and executed as 'King of the Jews', a political charge implying a challenge to Rome.
When and how
Jerusalem, c. AD 30 or 33; Pontius Pilate, prefect AD 26–36, and the high priest Caiaphas.
How we know
Tacitus (c. 116) reports that Christ was executed under Pilate; an inscription found at Caesarea in 1961 confirms Pilate's office.
Debates and open questions
The exact year and the roles of Roman and temple authorities are debated; later Christian blame of Jews collectively fueled centuries of antisemitism.
▸Charlemagne claimed to revive Roman EmpireWell documented
The connection
On Christmas Day 800, Pope Leo III crowned Charlemagne 'Emperor of the Romans' in St Peter's in Rome. The title claimed continuity with ancient Rome, though an emperor still ruled in Constantinople, which saw the crowning as an affront. The idea lived on in the Holy Roman Empire, which lasted until 1806.
When and how
Rome, December 25, 800; Byzantium accepted him as an emperor, though not 'of the Romans', in 812.
How we know
Frankish royal annals, Einhard's biography and the papal Liber Pontificalis describe the coronation; his seal reads 'Renovatio Romani Imperii', renewal of the Roman Empire.
Debates and open questions
Who gained more from the coronation, pope or king, and what the title meant to each of them, is still debated.