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Pompey vs Caesar: the rivals who broke the Republic

Military history · Head to head · ~6 min read · Updated October 2026

Detail of the 16th-century mural of the Battle of Pharsalus in the Galerie de Pharsale at the Château d'Ancy-le-Franc, painted in tones of brown, with horsemen and foot soldiers fighting with swords and lances.

Fresco in the Pharsalus gallery, photo DrGrototo, via Wikimedia Commons, CC0.

Quick answer

Who won, Pompey or Caesar?

Caesar won. After crossing the Rubicon in 49 BC to challenge Pompey and the Senate, he defeated Pompey decisively at Pharsalus in 48 BC, even though he was outnumbered. Pompey fled to Egypt, where he was murdered. Caesar then made himself dictator until his assassination in 44 BC.

They were allies, then father-in-law and son-in-law, then the two men whose rivalry tore the Roman Republic apart. Pompey the Great was Rome's first soldier until Julius Caesar surpassed him, and their rivalry was settled on the field of Pharsalus. Here they are, side by side.

Head to head

Pompey the GreatJulius Caesar
Lived106 to 48 BC1100 to 44 BC2
RoleRome's foremost general and statesmanGeneral, dictator, and conqueror of Gaul
Greatest workClearing the pirates and conquering the EastThe conquest of Gaul
Decisive battleDefeated at Pharsalus, 48 BCVictor at Pharsalus, 48 BC
StrengthOrganizer and conqueror of the EastBold, fast, and politically ruthless
The endMurdered in Egypt after Pharsalus, 48 BCAssassinated in Rome, 44 BC
Lasting legacyThe great man of the old RepublicThe dictator who ended the Republic

Pompey: the great man of the Republic

Pompey the Great was the most celebrated Roman of his generation, famous for sweeping the Mediterranean of pirates and for his conquests in the East. He joined Caesar and Crassus in the First Triumvirate and in 59 BC married Caesar's daughter Julia. Her death in childbirth in 54 BC, and the death of Crassus fighting the Parthians in 53 BC, removed the ties that had held the partnership together. As Caesar grew too powerful, Pompey became the champion of the Senate against him, and led the Republican cause in the civil war.3

Marble head of Pompey with a broad face and tousled hair in a museum gallery
Marble portrait of Pompey the Great in the Ny Carlsberg Glyptotek, Copenhagen. Public domain. Gunnar Bach Pedersen, 2006, via Wikimedia Commons.

Caesar: the man who ended the Republic

Julius Caesar made his name conquering Gaul, then crossed the Rubicon in 49 BC to challenge Pompey and the Senate. Outnumbered, he beat Pompey decisively at Pharsalus in 48 BC, pursued his rivals across the Mediterranean, and made himself dictator, until he was assassinated in 44 BC.4

Marble bust of a lean, older Julius Caesar on a pedestal
Marble bust of Julius Caesar in the Vatican Museums. CC0 (public domain)

The verdict

Pompey had the greater early career and, for a time, the greater name, the organizer who brought the East under Rome. But Caesar beat him where it counted, winning the decisive battle of the civil war against the odds at Pharsalus and reshaping Rome itself. Pompey was the last great soldier of the old Republic; Caesar was the man who ended it, and whose name became a title for emperors.

Renaissance painting of Caesar among soldiers as a kneeling man presents him with a severed head
Julius Caesar receiving the head of Pompey, painted by Giovanni Battista Bertucci about 1495; Royal Castle in Warsaw. Public domain

Compare more in Alexander vs Caesar and Caesar vs Hannibal, or meet the field in the greatest commanders of ancient Rome.

About this comparison

Each commander above has a full biography on this site, with its own sources. Judgments of who was "greater" are ours and openly a matter of debate; the facts and dates follow established histories. See our editorial policy.

Frequently asked questions

Who won, Pompey or Caesar?

Caesar. He defeated Pompey decisively at the Battle of Pharsalus in 48 BC; Pompey fled to Egypt, where he was murdered.5

Why did Pompey and Caesar go to war?

Once allies in the First Triumvirate, they fell out as Caesar's power grew. When the Senate, backed by Pompey, tried to strip Caesar of his command, he crossed the Rubicon and civil war followed.

What was the Battle of Pharsalus?

The decisive battle of the civil war, in 48 BC, where Caesar, though outnumbered, defeated Pompey's larger army in Greece.6

Who was the greater general?

Pompey had the more impressive early record, but Caesar beat him in their civil war and is generally ranked the greater commander for his campaigns in Gaul and the civil war.

How did Pompey die?

After losing at Pharsalus he fled to Egypt, where he was assassinated on the orders of the Egyptian court as he was about to step ashore in 48 BC.7

Notes

A number in the text points to a note; each note names the works that paragraph draws on, listed in full under Sources.

  1. World History Encyclopedia, “Pompey”. ↩
  2. Adrian Goldsworthy, Caesar. ↩
  3. Plutarch, Parallel Lives; Robin Seager, Pompey the Great; World History Encyclopedia, “Pompey”. ↩
  4. Adrian Goldsworthy, Caesar; World History Encyclopedia, “The Battle of Pharsalus”. ↩
  5. World History Encyclopedia, “Pompey”. ↩
  6. Julius Caesar, The Civil War. ↩
  7. Plutarch, Parallel Lives. ↩

Sources

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