The Battle of Philippi was a significant military confrontation that took place in 42 BCE, marking the decisive engagement in the Liberators' Civil War between the forces of Mark Antony and Octavian against the assassins of Julius Caesar, Brutus and Cassius. This battle not only resulted in the defeat and death of Brutus and Cassius but also paved the way for the rise of Octavian, who later became Augustus, the first Roman Emperor.