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Gaius Cassius Longinus
Republican Opposition

Gaius Cassius Longinus

Senator; Praetor; Liberator

Born: 85 BC · Rome
Died: 42 BC · Philippi, Macedonia — ordered his own freedman to kill him, October 3, 42 BC
Education: Educated in philosophy in Rhodes under the Epicurean philosopher Archelaus — which gave him an Epicurean worldview that made him more practically minded than the Stoic Brutus
Pre-war: Senator, praetor, and experienced military commander; survived the disaster of Carrhae (53 BC) under Crassus
"What we have done to Caesar, let Caesar's heir do to us."

Biography

Gaius Cassius Longinus was the organizing intellect of the Ides of March conspiracy — the man who recruited the other conspirators, planned the operation, chose the Theatre of Pompey as the site, and persuaded the wavering Brutus that the action was necessary. Without Cassius there would have been no conspiracy; without Brutus there would have been no moral cover. It was a partnership of political genius and philosophical principle that unraveled within hours of its apparent success. Cassius was a general of real ability — he had commanded the rear guard of Crassus's catastrophic defeat at Carrhae in 53 BC, organized the survivors into a coherent force, and defended Syria against the Parthian counterattack. He was practical where Brutus was idealistic, which is why their relationship was so productive and so tense. He had wanted Antony killed along with Caesar; he was overruled by Brutus. He predicted the consequences; they arrived on schedule. At the first Battle of Philippi, Cassius's wing was overwhelmed by Antony's attack. Sending a scout to determine what was happening on Brutus's side — where the Caesarians were actually losing — Cassius misread the scout's return as further bad news and concluded the entire battle was lost. He ordered his freedman Pindarus to kill him. Minutes later, messengers arrived with news that Brutus had won his half of the battle and that Cassius had died unnecessarily. Brutus covered his body and called him 'the last of the Romans.'

Did you know?

Cassius's suicide at Philippi is one of history's most tragic examples of miscommunication: he died believing his side had lost, when Brutus had actually just won. The battle's outcome might have been very different had Cassius lived another ten minutes.

Key Battles

Battle of Pharsalus

Caesarian Faction victory

August 9, 48 BC · 20,000 total casualties

Pharsalus was the single most decisive battle of the Roman Civil Wars and one of the most consequential battles in world history. It ended Pompey's military power in a single afternoon, established Caesar as the uncontested master of the Roman world, and made the survival of the Republic politically impossible. The word 'Pharsalia' became synonymous in Latin with utter defeat.

Battle of Philippi

Caesarian Faction victory

October–November 42 BC · 40,000 total casualties

Philippi destroyed the Republican cause as a military force. The deaths of Brutus and Cassius ended the last organized resistance to Caesar's heirs, and their posthumous transformation into tragic heroes — particularly through Plutarch's *Lives* and Shakespeare's *Julius Caesar* — shaped how Western culture understood the conflict for two thousand years.

Life Journey

Timeline

85 BC

🌅 Birth

Born in Rome

53 BC

📍 Posting

Commands the rear guard after Carrhae — saves the Roman survivors from Parthia

48 BC

⚔️ Battle

Fights for Pompey at Pharsalus; pardoned by Caesar

March 15, 44 BC

📍 Posting

Organizes and executes the assassination of Julius Caesar

October 3, 42 BC

✝️ Death

Commits suicide at Philippi after misreading the battle's outcome