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Julius Caesar
100–44 BC· Person· Europe
Well documentedSolid records, physical evidence or scientific consensus.
Roman general and politician who conquered Gaul, won a civil war and ruled Rome as dictator until his murder.
See it on the Battles & Wars map →What happened
Caesar rose through Roman politics to become consul in 59 BC, then conquered Gaul as governor (58–50 BC). Ordered by the Senate to give up his army, he crossed the Rubicon River into Italy in January 49 BC, starting a civil war. He defeated his rival Pompey at Pharsalus in 48 BC and was named dictator, finally for life. He reformed the calendar, the basis of today's. On March 15, 44 BC, senators led by Brutus and Cassius stabbed him to death.
Why it matters
His career broke the Roman Republic. His adopted heir Octavian became the first emperor, and 'Caesar' became a title, surviving as Kaiser and Tsar.
Legacy and how we know
His own war commentaries, Cicero's letters and speeches, and later biographies by Plutarch and Suetonius. Coins with his portrait survive, and the Julian calendar is a living legacy.
Still debated
Whether he meant to make himself king, or simply drifted into one-man rule, is still debated.
Connections (7)
▸Julius Caesar led Gallic WarsWell documented
The connection
Caesar started the war on his own initiative as governor, used each incident to push deeper, and commanded in person. His speed, risk-taking and skill at playing tribal leaders against each other drove the conquest. He also wrote its official history, the Commentaries, to sell his achievements to voters back in Rome.
When and how
Gaul and Britain, 58–50 BC; Caesar as governor of Cisalpine Gaul, Illyricum and Transalpine Gaul.
How we know
Caesar's own account, Cicero's letters, and later histories by Suetonius, Plutarch and Cassius Dio.
Debates and open questions
Whether the war was a defensive response to tribal migrations, as Caesar claimed, or a planned conquest for glory and money is argued.
▸Julius Caesar won Battle of AlesiaWell documented
The connection
Caesar's choice to besiege rather than storm Alesia, and to build a second line facing outward, decided the battle. On the final day he led reserves to the weakest point, recognizable by his scarlet cloak, while cavalry struck the attackers from behind. The relief army broke, and Vercingetorix surrendered the next day.
When and how
Alesia, near Alise-Sainte-Reine in Burgundy, France, late summer to autumn 52 BC.
How we know
Caesar's Commentaries, Book 7, describes his role; excavations confirm the scale of the siege works he ordered.
Debates and open questions
Caesar is his own source, so his personal heroics may be polished; no Gallic account survives.
▸Julius Caesar paved the way for Roman EmpireWell documented
The connection
Caesar showed that a general with a loyal army could override the Senate, and his dictatorship for life ended the Republic in practice. His adopted heir Octavian inherited his name, money and the soldiers' loyalty, and used them to build the imperial system Caesar had foreshadowed but never formalized.
When and how
Rome, 49–44 BC; Caesar's will, read after his murder in March 44 BC, adopted Octavian as his son.
How we know
Cicero's contemporary letters and later histories by Suetonius and Cassius Dio document the path from Caesar's dictatorship to Augustus.
Debates and open questions
Whether Caesar intended a monarchy, and whether the Republic was already doomed before him, are long-running debates.
▸Julius Caesar was assassinated, starting civil wars ending at Battle of ActiumWell documented
The connection
Caesar's murder in 44 BC did not restore the Republic. His heir Octavian and his lieutenant Mark Antony first beat the assassins Brutus and Cassius at Philippi in 42 BC, then divided the empire between them. Their rivalry grew into the final civil war, settled at Actium.
When and how
Rome, March 15, 44 BC; Philippi in Macedonia, 42 BC; Actium, western Greece, 31 BC.
How we know
Cicero's letters and speeches, Appian's Civil Wars and Cassius Dio document the chain of events step by step.
Debates and open questions
Whether a different settlement after the assassination could have saved the Republic is a counterfactual historians still argue.
▸Alexander the Great inspired the ambitions of Julius CaesarMostly agreed
The connection
Educated Romans grew up on stories of Alexander. Suetonius says Caesar, in his early 30s, sighed before Alexander's statue in Spain because he had achieved nothing memorable at the age Alexander had conquered the world. In that telling, Alexander was the yardstick Caesar measured his own career against.
When and how
Gades (modern Cádiz), Spain, around 69 BC, when Caesar was a junior official (quaestor).
How sure are we?
Suetonius tells it, writing more than 150 years later; Plutarch gives a version with Caesar weeping over a history of Alexander, and paired the two men in his 'Parallel Lives'.
Debates and open questions
The story may be a moralizing legend, and how much Alexander actually guided Caesar's choices, rather than Roman politics, is unknowable.
▸Julius Caesar suffered his one personal defeat in Gaul at Battle of GergoviaWell documented
The connection
Caesar tried to take Gergovia by a ruse: a feint drew Gallic defenders away while his legions seized ground below the town. His troops ignored the recall signal, attacked the walls and were driven back. It was the only defeat he suffered in Gaul in a battle he personally commanded, and he lifted the siege.
When and how
Gergovia, central France, spring 52 BC; Caesar with six legions against Vercingetorix's Gauls.
How we know
Caesar's own account admits nearly 700 dead, including 46 centurions, and blames his soldiers' eagerness; archaeology confirms the Roman camps.
Debates and open questions
Caesar may have played down his losses. The ambush at Atuatuca in 54 BC killed more Romans, but under his deputies, so 'worst defeat' depends on how one counts.
▸Julius Caesar launched and won Caesar's Civil War: the Rubicon and PharsalusWell documented
The connection
Caesar's enemies in the Senate ordered him to give up his army before he could stand for a second consulship, which would expose him to prosecution. Rather than submit, he led troops across the Rubicon into Italy, an act of war. He then beat Pompey's side across the Mediterranean in four years.
When and how
The Rubicon in northern Italy, January 10 or 11, 49 BC, through to Munda in southern Spain, March 45 BC.
How we know
Caesar's own Civil War commentaries and Cicero's letters written at the time; Suetonius and Plutarch later describe the crossing.
Debates and open questions
Who was more to blame, Caesar or his Senate opponents, has been argued since ancient times, and the legal end date of his command is unclear.