The Constitutional reforms of Augustus were a series of laws that were enacted by the Roman Emperor Augustus between 30 BC and 2 BC, which transformed the Constitution of the Roman Republic into the Constitution of the Roman Empire. The era that began when Augustus (then named Imp. Caesar Divi Filius, but often called Octavian by historians) defeated Mark Antony and Cleopatra in the final war of the Roman Republic in 30 BC, and ended when the Roman Senate granted Augustus the title "Pater Patriae" in 2 BC.