In 43 BCE, Octavian formed the Second Triumvirate with Marc Antony and Lepidus. They defeated Brutus and Cassius and divided the empire with Octavian holding most of the West and Antony the East. In 33 BC, the Second Triumvirate ended, leaving Antony without legal authority. Octavian then began a campaign against him, declaring war against Cleopatra.
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The Battle of Actium was a naval battle fought between Octavian's fleet, led by Marcus Agrippa, and the combined fleets of Mark Antony and Cleopatra on 2 September 31 BC in the Ionian Sea. In early 31 BC, Antony and Cleopatra were temporarily stationed in Greece. Mark Antony possessed 500 ships and 70,000 infantry and made his camp at Actium. He was soon trapped on both land and sea. Antony's fleet sailed out through the straits of Actium in a desperate attempt to break free of Marcus Agrippa's naval blockade. On this morning, 2 September, 31 BC, the battle that ended the Roman Republic was about to begin. Before dawn, Octavian was walking his lines at Actium when he met a man driving a donkey. He asked the man his name. Eutychus, the man said. It means Fortunate. And the donkey? Nikon. It means Victor. By nightfall Antony and Cleopatra's fleet was broken.
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 | While fleets were about equal, Antony was eventually routed by Octavian's smaller, more maneuverable ships. On September 2, Antony and Cleopatra managed to escape with a small force, leaving the rest of his army to surrender to Octavian. The end came in Alexandria on 1 August 30 BC. Antony and Cleopatra committed suicide.
On the hill where he had camped, Octavian built the 'Campsite Memorial of Augustus'. Into its wall he set the bronze rams stripped from Antony's captured ships. Thirty six of them, in sockets cut to fit each one.
On the wall, he thanked Mars and Neptune.
Pace parta terra marique: peace won on land and sea.
|  Beside it, in bronze, he put a donkey. |
 The lifetime aureus shown was minted while Octavian retained his name, around 32-31 BC and the time of the Battle of Actium. It features the inscription "CAESAR DIVI F" on the reverse, which translates to "Caesar, son of a god". | Octavian's victory enabled him to consolidate power. He adopted the title of Princeps (first citizen), and in 27 BC was awarded the title of Augustus (revered) by the senate. The reign of Augustus gave Rome a golden era known as the 'Pax Romana' during which he served for 41 years. It was Augustus’ coinage reform in 23 BCE that saw the aureus come into consistent use.
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