History of Rome Timeline

Julius Caesar, Pompey the Great, and Crassus formed an informal political alliance that dominated Roman politics. The arrangement allowed Caesar to launch his conquest of Gaul, but collapsed after Crassus died at Carrhae and rivalry grew between the remaining two.

Image source: First Triumvirate

Julius Caesar waged a brutal eight-year campaign conquering Gaul, culminating in the siege of Alesia against Vercingetorix. The conquest brought vast wealth, glory, and a veteran army loyal to Caesar personally, setting the stage for civil war.

Image source: Gallic Wars

By leading his army across the Rubicon river into Italy proper, Caesar committed treason and triggered civil war against Pompey and the Senate. His declaration 'the die is cast' became proverbial for an irreversible decision.

Image source: Crossing the Rubicon

Caesar, recently named dictator perpetuo, was stabbed to death by some sixty senators led by Brutus and Cassius in the Theater of Pompey. Far from saving the republic, his murder plunged Rome into renewed civil war.

Image source: Assassination of Julius Caesar

Octavian's fleet under Agrippa decisively defeated the combined forces of Mark Antony and Cleopatra off western Greece. The victory left Octavian sole ruler of the Roman world; Antony and Cleopatra fled to Egypt and soon took their own lives.

Image source: Battle of Actium

Nearly fifty years of chaos saw dozens of emperors rise and fall through assassination, barbarian invasions, plague, economic collapse, and breakaway states like the Gallic Empire. Diocletian's accession in 284 finally ended the crisis and restored imperial authority.

Image source: Crisis of the Third Century

Constantine and Licinius proclaimed religious tolerance throughout the empire, legalizing Christianity after Constantine's victory at the Milvian Bridge. This pivotal act set Christianity on the path to becoming the dominant religion of Europe.

Image source: Edict of Milan

Constantine dedicated his new capital on the site of Byzantium, strategically positioned between Europe and Asia. Constantinople would flourish for over a thousand years as the heart of the Eastern Roman, or Byzantine, Empire.

Image source: Constantinople

After Theodosius I died, the empire was permanently split between his sons Honorius in the West and Arcadius in the East. The division proved irreversible, with the wealthy Greek East increasingly diverging from the Latin West.

Image source: Western Roman Empire

Alaric's Visigoths stormed Rome and plundered it for three days, the first time the city had fallen to a foreign enemy in eight centuries. The shock reverberated across the Mediterranean and inspired Augustine to write The City of God.

Image source: Sack of Rome (410)

The Germanic general Odoacer deposed the boy-emperor Romulus Augustulus and declared himself King of Italy, sending the imperial regalia to Constantinople. This event traditionally marks the end of the Western Roman Empire and the beginning of the Middle Ages.

Image source: Fall of the Western Roman Empire

Octavian received the title Augustus from the Senate and carefully consolidated supreme power while preserving republican forms. He reigned for over four decades, establishing the Principate, expanding the empire, and ushering in the long era of peace known as the Pax Romana.

Image source: Augustus

For roughly two centuries, the empire enjoyed relative internal peace, stability, and unprecedented prosperity. Trade flourished along roads and sea lanes, cities grew, and Roman law and culture spread across the Mediterranean world and beyond.

Image source: Pax Romana

A devastating fire destroyed much of Rome during Nero's reign. Rumors accused the emperor of playing the lyre while the city burned, and Nero deflected blame onto Christians, initiating the first major persecution of the new faith while rebuilding the city grandly.

Image source: Great Fire of Rome

After Nero's suicide, four emperors—Galba, Otho, Vitellius, and Vespasian—claimed power in rapid succession amid civil war. Vespasian emerged victorious, founding the Flavian dynasty and restoring stability to the empire.

Image source: Year of the Four Emperors

Vesuvius erupted catastrophically, burying the towns of Pompeii and Herculaneum under ash and pyroclastic flows. Pliny the Younger's eyewitness account preserved the disaster, and the remarkably intact ruins later became the world's finest window into daily Roman life.

Image source: Eruption of Mount Vesuvius in 79 AD

Begun by Vespasian on the site of Nero's Golden House, the Colosseum opened under Titus with one hundred days of games. It could hold up to 50,000 spectators watching gladiatorial combat, animal hunts, and even naumachiae, becoming the enduring symbol of Rome.

Image source: Colosseum

The emperor Trajan conquered Dacia and Mesopotamia, bringing the Roman Empire to its maximum territorial extent. His reign marked the height of imperial power, celebrated by Trajan's Column and Forum in Rome and remembered as the era of the Five Good Emperors.

Image source: Trajan

Emperor Hadrian ordered a 73-mile fortified wall across northern Britain to mark and defend the empire's frontier. Garrisoned by auxiliary troops, it stood as the northwestern edge of Roman power and remains one of Rome's greatest surviving engineering works.

Image source: Hadrian's Wall

An epidemic, likely smallpox, brought back by troops from the East killed millions across the empire, possibly including Emperor Marcus Aurelius. The plague weakened armies, disrupted economies, and foreshadowed the crises of later centuries.

Image source: Antonine Plague

Caracalla's edict extended Roman citizenship to virtually all free inhabitants of the empire, transforming a civic privilege into an imperial identity. The move broadened the tax base but diluted the traditional distinction between Romans and provincials.

Image source: Constitutio Antoniniana