Marcus Brutus Brutus, Marcus Junius Roman assassin, conspirator, and politician; fought alongside Pompey the Great and against Julius Caesar at battle of Pharsalus 048b, but defeated and pardoned by Caesar; governor of Cisalpine Gaul 046b; praetor 044b; with Decimus Brutus and Gaius Cassius Longinus, led successful assassination conspiracy against Julius Caesar 044b; upon popular uprising against conspirators, fled to Macedonia and raised army 044b, with support of senate; joined Cassius in opposition to Mark Antony and Octavian, but defeated at battle of Philippi 042b; suicide _085b-042b