Since the first triumvirate worked so well (for Caesar anyway) Octavian decided it might behoove him to give it a try. Naturally, the first person he thought of was public enemy number one: Antony. Once more things were revised to Antony good, assassins bad, populace confused. Of course, a triumvirate needs three people, so Octavian asked Lepidus, the governor of Transalpine Gaul and not a very memorable figure, to be their third.
Being the trusting folks that they are, they met on an island in the middle of a river, in full view of all their soldiers to set things up. (And they wonder why it fell apart…) First and foremost they divided up the empire. Antony got East and North France. Lepidus got Spain and South France. Octavian got Africa, Corsica, Sardinia, and Sicily. Octavian was pretty smug about this since he won four countries and the others only two. (But Antony and Lepidus pulled a fast one on him—his countries were the crappy ones. At least he made up for it by marrying Antony’s step-daughter.)
Combining all three armies, the triumvirate marched on Rome with their demands, where they were made legal rulers by the Senate. Learning from their last alliance, Antony and Octavian knew better than to sit around in Rome distrusting each other (it only leads to death threats) so they decided to pick a common enemy. Having already taken down one Brutus, they decided to make a clean sweep and defeat the original.
Antony and Octavian marched east to Philippi in 42 BC to confront Brutus and Cassius once and for all. Unfortunately, they quickly found themselves cut off from a retreat to Italy by a fleet that would not allow them access to either reinforcements or food. Brutus and Cassius sat back and waited for them to starve (or kill each other considering their track record.) For once, Antony displayed a remarkable flash of ingenuity, and remembering the swampy bog that had once been Rome, he began to “civilize” the impassable marsh which flanked them. Before the food ran out, he had created a causeway to their supplies.
This meant there was a battle after all, but fate seemed to be deciding things via coin toss. Brutus’s army defeated Octavian soundly, but Antony demolished Cassius’s. This stalemate might have dragged out longer if Cassius had not gotten word that Brutus was defeated. Believing all to be lost, he killed himself. When Brutus found out about Cassius’s death, he too committed suicide. This just goes to show that in some matters you do not trust the messenger. Or at least check for a pulse. (You should be learning from this, Antony!) Thus ended the “most noblest Roman of them all.”