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Augustus, Roman Emperor, (c1590-1629). Gaius Julius Caesar Octavianus (63 BC-14 AD) became one of a triumvirate of rulers after the death in 44 BC of Julius Caesar, his great-uncle, whose dictatorship had brought an end to the Roman republic. He became sole ruler in 31 BC after defeating Mark Anthony at the Battle of Actium, and in 27 BC proclaimed himself Emperor, adopting the title Caesar Augustus. Octavian's rule, which lasted until 14 AD, ended a century civil strife and was a period of peace and prosperity in which Rome attained the height of its imperial power.