Final answer:
The Battle of Philippi started after the assassination of Julius Caesar. Octavian emerged victorious in the power struggle that followed.
Step-by-step explanation:
The Battle of Philippi started after the assassination of Julius Caesar.
The assassination of Julius Caesar led to a power struggle between his rightful heir, Octavian, and Mark Antony. Octavian eventually emerged victorious in this struggle, solidifying his control over the Roman world.