Marcus Antonius (in Latin: M·ANTONIVS·M·F·M·N) (January 14, 83 BC – August 1, 30 BC), known in English as Mark Antony, was a Roman politician and general. As a military commander and administrator, he was an important supporter and loyal friend of Julius Caesar. After Caesar's assassination, Antony formed an official political alliance with Octavian (the future Augustus) and Lepidus, known to historians today as the Second Triumvirate.

The triumvirate broke up in 33 BC. Disagreement between Octavian and Antony erupted into civil war, the final war of the Roman Republic, in 31 BC. Antony was defeated by Octavian at the naval Battle of Actium, and in a brief land battle at Alexandria. He and his lover Cleopatra committed suicide shortly thereafter. His career and defeat are significant in Rome's transformation from Republic to Empire.

A member of the Antonia clan (gens), Antony was born in the winter of 87-6 BC, or as late as 83, based on Plutarch's record of two traditions of his age at the time of his death in 30 BC. The day and month of his birth are securely attested as 14 January. He was the homonymous and thus presumably the eldest son of Marcus Antonius Creticus (praetor 74 BC), grandson of the great Marcus Antonius Orator (consul 99 BC, censor 97-6 BC) who had been murdered and decapitated in the Marian Terror of winter 87-6 BC.

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