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BATTLE // -30 BCE

Battle of Actium

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Overview

The Battle of Actium was a naval battle fought between Octavian's maritime fleet, led by Marcus Agrippa, and the combined fleets of Mark Antony and Cleopatra. The battle took place on 2 September 31 BC in the Ionian Sea, near the former Roman colony of Actium, Greece, and was the climax of over a decade of rivalry between Octavian and Mark Antony.

Overview adapted from Wikipedia, licensed under CC BY-SA 4.0.

Significance

The Battle of Actium, fought on 2 September 31 BC in the Ionian Sea near the former Roman colony of Actium, Greece, was the decisive engagement of the Final War of the Roman Republic and the climax of more than a decade of rivalry between Octavian and Mark Antony. The engagement pitted Octavian's fleet, under the operational command of Marcus Agrippa, against the combined naval forces of Mark Antony and Cleopatra. Octavian's force of 16,000 faced an opposing strength estimated between 20,000 and 70,000, yet Roman casualties for Octavian stood at 2,500 against 5,000 for Antony, indicating a clear operational victory. The outcome effectively ended Antony's capacity to contest control of the Roman world, leading directly to the consolidation of power under Octavian that defined the transition from republic to empire.

Forces & casualties

Troop strength

  • Octavian16,000
    medium
  • Antony20,000–70,000
    medium

Antony fielded a 2.8 : 1 numerical advantage

Casualties

  • Octavian2,500
    medium16% loss rate
  • Antony5,000
    medium11% loss rate

Commanders (8)

Last verified July 2026
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