A soldier who backed a rising general
Marcus Antonius, known in English as Mark Antony, made his name as a cavalry commander in the east before joining Julius Caesar as a trusted lieutenant in Gaul and the civil war against Pompey. As consul in 44 BCE, he was beside Caesar when the dictator was assassinated, and it was his funeral oration — dramatised long afterward by Shakespeare — that turned public anger against the conspirators.
Triumvir and rival to a teenage heir
Caesar’s will named his eighteen-year-old great-nephew Octavian, not Antonius, as principal heir, setting the two men on a collision course they postponed rather than resolved. In 43 BCE, Antonius, Octavian, and Lepidus formed the Second Triumvirate, a legally sanctioned dictatorship that proscribed their enemies and defeated Caesar’s assassins at Philippi. The alliance was cemented in 40 BCE by Antonius’s marriage to Octavian’s sister, Octavia Minor.
Cleopatra, Actium, and defeat
Antonius’s deepening political and personal alliance with Cleopatra VII of Egypt, and his provisions granting territory to their children, gave Octavian the material for a propaganda campaign that cast Antonius as a Roman general gone native. Octavian defeated the couple’s fleet at Actium in 31 BCE; both took their own lives in Alexandria the following year. Rome absorbed Egypt as a province, and Octavian, soon to be Augustus, stood without a rival.
An ancestor despite defeat
Antonius lost the war, but not his place in the dynasty’s bloodline: his daughters by Octavia, Antonia Major and Antonia Minor, carried his descent into the Julio-Claudian house. Antonia Minor’s children included Germanicus and the emperor Claudius, and her grandson was Caligula — making the loser of Actium a direct ancestor of three of the five Julio-Claudian emperors.
Historical sources
Plutarch, Life of Antony
The fullest ancient biography, shaping most later accounts including Shakespeare’s.
Suetonius, Augustus 17
The aftermath of Actium and the annexation of Egypt.
Cassius Dio, Roman History 49–51
The triumviral period, the eastern settlements, and the final war.
Portrait: Sergey Sosnovskiy / Wikimedia Commons, CC BY-SA 4.0. Resized for display.