Lably
Skip to content

Battle of Actium

Naval battle between Octavian and Mark Antony/Cleopatra (31 BC)

  • 16 min read
  • 3 chapters
Battle of Actium
Mark Landon · CC BY 4.0

Related on Lably

Through Blockade and Roman Empire

In early 31 BC, the year of the battle, Antony and Cleopatra were temporarily stationed in Greece. Mark Antony possessed 500 ships and 70,000 infantry and made his camp at Actium, while Octavian, with 400 ships and 80,000 infantry, arrived from the north and occupied Patrae and Corinth, where, with the help of Marcus Vipsanius Agrippa, he managed to cut Antony's southward communications with Egypt via the Peloponnese. Octavian had previously gained a preliminary victory in Greece, where his navy successfully ferried troops across the Adriatic Sea under the command of Agrippa. Octavian landed on mainland Greece, opposite the island of Corcyra (modern Corfu), and proceeded south on land.

Trapped on both land and sea, Antony's army saw portions desert and flee to Octavian's side, while Octavian's forces became confident enough to make preparations for battle. Antony's fleet sailed out through the straits of Actium in a desperate attempt to break free of the naval blockade, but faced, fought and was eventually routed by Octavian's fleet of smaller, more maneuverable ships. Antony and his remaining forces were spared only due to a last-ditch effort by Cleopatra's fleet that had been waiting nearby. Octavian pursued them and defeated their forces in Alexandria on 1 August 30 BC—after which Antony and Cleopatra took their own lives.

Octavian's victory enabled him to consolidate his power over Rome and its dominions. He adopted the title of Princeps ("first citizen"), and in 27 BC was awarded the title of Augustus ("revered") by the Roman Senate. This became the name by which he was known in later times. As Augustus, he retained the trappings of a restored Republican leader, but historians generally view his consolidation of power and the adoption of these honorifics as the end of the Roman Republic and the beginning of the Roman Empire.

Background

The alliance among Octavian, Mark Antony and Lepidus, commonly known as the Second Triumvirate, was renewed for a five-year term at Tarentum in 37 BC. However, the triumvirate broke down when Octavian saw Caesarion – the professed son of Julius Caesar and Queen Cleopatra VII of Egypt – as a major threat to his power. This occurred when Mark Antony, the other most influential member of the triumvirate, abandoned his wife, Octavian's sister Octavia Minor. Afterward he moved to Egypt to start a long-term romance with Cleopatra, becoming Caesarion's de facto stepfather. Octavian and the majority of the Roman Senate saw Antony as leading a separatist movement that threatened to break the Roman Republic's unity.

Octavian's prestige and, more importantly, his legions' loyalty had been boosted by Julius Caesar's legacy of 44 BC, by which he was officially adopted as Caesar's only son and the sole legitimate heir of his enormous wealth. Antony had been the most important and most successful senior officer in Caesar's army (magister equitum) and, thanks to his military record, claimed a substantial share of the political support of Caesar's soldiers and veterans. Both Octavian and Antony had fought against their common enemies in the Liberators' civil war that followed the assassination of Caesar.

After years of loyal cooperation with Octavian, Antony started to act independently, eventually arousing his rival's suspicion that he was vying to become sole master of Rome. When he left Octavia Minor and moved to Alexandria to become Cleopatra's official partner, many Roman politicians suspected that he was trying to become the unchecked ruler of Egypt and other eastern kingdoms while still maintaining his command over the many Roman legions in the East. As a personal challenge to Octavian's prestige, Antony tried to get Caesarion accepted as a true heir of Caesar, even though the legacy did not mention him. Antony and Cleopatra formally elevated Caesarion, then 13, to power in 34 BC, giving him the title "King of the Kings" (Donations of Alexandria). Such an entitlement was seen as a threat to Roman republican traditions. It was widely believed that Antony had once offered Caesarion a diadem. Thereafter, Octavian started a propaganda war, denouncing Antony as an enemy of Rome and asserting that he intended to establish a monarchy over the Roman Empire on Caesarion's behalf, circumventing the Roman Senate. It was also said that Antony intended to move the imperial capital to Alexandria.

As the Second Triumvirate formally expired on the last day of 33 BC, Antony wrote to the Senate that he did not wish to be reappointed. He hoped that it might regard him as its champion against the ambition of Octavian, whom he presumed would not be willing to abandon his position in a similar manner. The causes of mutual dissatisfaction between the two had been accumulating. Antony complained that Octavian had exceeded his powers in deposing Lepidus, in taking over the countries held by Sextus Pompeius and in enlisting soldiers for himself without sending half to him. Octavian complained that Antony had no authority to be in Egypt; that his execution of Sextus Pompeius was illegal; that his treachery to the king of Armenia disgraced the Roman name; that he had not sent half the proceeds of the spoils to Rome according to his agreement; and that his connection with Cleopatra and acknowledgement of Caesarion as a legitimate son of Caesar were a degradation of his office and a menace to himself.

In 32 BC, one-third of the Senate and both consuls, Gnaeus Domitius Ahenobarbus and Gaius Sosius, allied with Antony. The consuls had determined to conceal the extent of Antony's demands. Ahenobarbus seems to have wished to keep quiet, but on 1 January Sosius made an elaborate speech in favor of Antony, and would have proposed the confirmation of his act had it not been vetoed by a tribune. Octavian was not present, but at the next meeting made a reply that provoked both consuls to leave Rome to join Antony; Antony, when he heard of it, after publicly divorcing Octavia, went at once to Ephesus with Cleopatra, where a vast fleet was gathered from all parts of the East, of which Cleopatra furnished a large proportion. After staying with his allies at Samos, Antony moved to Athens. His land forces, which had been in Armenia, came down to the coast of Asia and embarked under Publius Canidius Crassus.

Octavian kept up his strategic preparations. Military operations began in 32 BC, when his general Agrippa captured Methone, a Greek town allied to Antony. But by the publication of Antony's will, which Lucius Munatius Plancus had put into Octavian's hands, and by carefully letting it be known in Rome what preparations were going on at Samos and how Antony was effectively acting as the agent of Cleopatra, Octavian produced such a violent outburst of feeling that he easily obtained Antony's deposition from the consulship of 31 BC, for which Antony had been designated. In addition to the deposition, Octavian procured a proclamation of war against Cleopatra. This was well understood to mean against Antony, though he was not named. In issuing a declaration of war, the Senate deprived Antony of any legal authority.

Sign in to keep reading

2 more chapters are free with a Lably account.

More in Ancient