Octavian becomes emperor (jan 1, 40 BC – feb 24, 31 BC)

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In 40 Bc Antony married Octavian's sister Octavia. Eight years later, however he divorced her to marry Cleopatra, the queen of Egypt. Octavian this divorce as an insult to his sister and to himself. Antony's behavior led to civil war in Rome. In 31 BC Octavian sent a fleet to attack Antony. Antony sailed sailed out to meet it, and the two forces met just west of Greece in the battle of Actium Antony's fleet was defeated, but he escaped to Egypt with Cleopatra. There the two committed suicide so they wouldn't be taken prisoner by Octavian. Octavian then became Rome's sole ruler