The Battle of Philippi was a significant moment in ancient history, and there are a few different synonyms you could use to refer to it. One option could be the Philippi War, which could be a more general term to refer to all of the battles that took place in the area. Another option could be the Second Triumvirate War, which would better specify which period of history the battle took place in, as it occurred during the time of the Roman Triumvirate. Whatever term you choose, the Battle of Philippi marks an important turning point in history and served as a stepping stone for the rise of the Roman Empire.