A bust of Cassius
Gaius Cassius Longinus, often referred to as simply Cassius, was a Roman senator and general best known as a leading instigator of the plot to assassinate Julius Caesar on March 15, 44 BC. He was the brother-in-law of Brutus, another leader of the conspiracy.
He commanded troops with Brutus during the Battle of Philippi against the combined forces of Mark Antony and Octavian, Caesar's former supporters, and committed suicide after being defeated by Mark Antony. He alongside Brutus and Judas form the Three Great Traitors.
Cassius was elected as a Tribune of the Plebs in 49 BC. He opposed Caesar, and eventually he commanded a fleet against him during Caesar's Civil War: after Caesar defeated Pompey in the Battle of Pharsalus, Caesar overtook Cassius and forced him to surrender. After Caesar's death, Cassius fled to the East, where he amassed an army of twelve legions. He was supported and made Governor by the Senate. Though he and Brutus marched west against the allies of the Second Triumvirate, Cassius was defeated at the Battle of Phillippi and committed suicide.
He followed the teachings of the philosopher Epicurus, although scholars debate whether or not these beliefs affected his political life. After his death, he is condemned to Hell for his sins and is shown in the lowest circle of Hell where he is gnawed and chewed on by one of Satan's heads for all eternity as punishment for betraying and killing Caesar.