Cassius Longinus, Gaius, << KASH ih uhs lon JY nuhs, GAY uhs >> (?-42 B.C.), was a Roman general and statesman who, with Marcus Junius Brutus, led the conspiracy against Julius Caesar. During the civil war between Caesar and Pompey, Cassius commanded a fleet for Pompey. Caesar won the war, pardoned Cassius, and made him praetor (administrator of the courts) in 44 B.C. But Cassius helped murder Caesar later that year. Cassius and his brother-in-law Brutus fled east and raised a large army. Mark Antony and Octavian defeated them at Philippi, in Macedonia. Cassius committed suicide when his camp was taken.