Augustus Caesar, also known as Gaius Octavius, was the first Roman emperor, and ruled the Roman Empire between 31 B.C. and his death in A.D. 14. Some historians date his reign beginning in 27 B.C., when he dispensed with republican titles and accepted the title "Augustus."
Though Augustus' adopted father, Julius Caesar, had taken dictatorial power in Rome, he never took the title "emperor." Augustus did not become emperor immediately after Julius Caesar's assassination. Instead, he and two others, Marcus Lepidus and Mark Antony, formed a triumvirate to defeat the assassins and jointly rule Rome as military dictators. However, this alliance soon broke down, leading to another civil war, which Augustus won, leaving him in sole control of Rome.