Beginning with Caesar's assassination in 44 BCE and ending with Octavian's victory over Anthony and Cleopatra at Actium in 31 BCE, Rome had been engaged in a series of almost constant civil wars. After almost 15 years of political and social upheaval, Octavian, the sole surviving member of the Second Triumvirate, became firmly established as the new leader of the Roman world. Under Octavian, Rome enjoyed a long period of relative peace and prosperity. However, Octavian's victory at Actium also sounded the death knell of the Republic. With Octavian as the sole ruler of the Roman world, the Roman Empire was born.