Over the next few hundred years, various generals would bypass or overthrow the Senate for various reasons, mostly to address perceived injustices, either against themselves or against poorer citizens or soldiers. One of those generals was Julius Caesar, where he marched on Rome and took supreme power over the republic. Caesar's career was cut short by his assassination at Rome in 44 BCE by a group of Senators including Marcus Junius Brutus. In the power vacuum that followed Caesar's assassination, his friend and chief lieutenant, Marcus Antonius, and Caesar's grandnephew Octavian who also was the adopted son of Caesar, rose to prominence. Their combined strength gave the triumvirs absolute power. However, in 31 BCE war between the two broke out. The final confrontation occurred on 2 September 31 BCE, at the naval Battle of Actium where the fleet of Octavian under the command of Agrippa routed Antony's fleet. Thereafter, there was no one left in the Roman Republic who wanted to, or could stand against Octavian, and the adopted son of Caesar moved to take absolute control. Octavian left the majority of Republican institutions intact, though he influenced everything using personal authority and ultimately controlled the final decisions, having the military might to back up his rule if necessary. By 27 BCE the transition, though subtle, disguised, and relying on personal power over the power of offices, was complete. In that year, Octavian offered back all his powers to the Senate, and in a carefully staged way, the Senate refused and titled Octavian "Augustus" — "the revered one". He was always careful to avoid the title of "rex" — "king", and instead took on the titles of "princeps" — "first citizen" and "imperator", a title given by Roman troops to their victorious commanders.