Battle of Actium Timeline

Julius Caesar was assassinated by a group of senators led by Brutus and Cassius on the Ides of March. His death plunged Rome into a series of civil wars that ultimately destroyed the Republic and set the stage for the confrontation between Octavian and Mark Antony at Actium.

Image source: Assassination of Julius Caesar

Octavian, Mark Antony, and Lepidus formed the Second Triumvirate, a three-man dictatorship legally established to restore order to the Roman Republic after Julius Caesar's assassination. The triumvirs divided the Roman world among themselves, but tensions between Octavian and Antony would eventually erupt into open civil war.

Image source: Second Triumvirate

The forces of the Second Triumvirate, led by Antony and Octavian, defeated the armies of Brutus and Cassius at Philippi in Macedonia. The victory avenged Caesar's death and left Antony and Octavian as the dominant powers in Rome, with their rivalry simmering beneath the surface.

Image source: Battle of Philippi

Mark Antony summoned Cleopatra VII of Egypt to Tarsus to answer for allegedly aiding his enemies. Instead, the famous meeting sparked a romantic and political alliance between the two leaders. Antony spent the winter in Alexandria, deepening both his bond with Cleopatra and suspicions in Rome about his ambitions.

Image source: Cleopatra

Following tensions between Octavian and Antony, the Treaty of Brundisium divided the Roman world: Antony received the East, Octavian the West, and Lepidus Africa. The treaty was sealed by Antony's marriage to Octavian's sister, Octavia Minor, temporarily averting civil war.

Image source: Second Triumvirate

Antony launched a major invasion of Parthia through Armenia, but the campaign ended in catastrophic failure, with the loss of nearly half his army during a brutal retreat. The defeat damaged his military reputation and strengthened Octavian's position in Rome.

Image source: Antony's Atropatene campaign

In a lavish ceremony in Alexandria, Antony declared Caesarion, Cleopatra's son by Julius Caesar, the true heir of Caesar, and granted vast territories to Cleopatra and their children as kings and queens. In Rome, Octavian portrayed these acts as treason against the Roman people, fueling anti-Antony propaganda.

Image source: Donations of Alexandria

Octavian illegally seized Antony's will from the Vestal Virgins and read it publicly to the Roman people. The document revealed Antony's wishes to be buried in Alexandria beside Cleopatra and his grants of Roman territory to his children, turning public opinion decisively against him.

Image source: War of Actium

The Senate, pressured by Octavian, declared war not on Antony directly but on Cleopatra, framing the coming conflict as a war against a foreign queen rather than a civil war. This clever framing allowed Octavian to claim he was defending Rome from an Eastern threat.

During the summer of 31 BC, malaria and dysentery swept through Antony's camp, while Agrippa's naval blockade cut off supplies. Thousands of soldiers died or deserted, including senior allies such as Domitius Ahenobarbus, leaving Antony increasingly desperate to break out.