The First Triumvirate was composed of Julius Caesar, Pompeius Magnus (Pompey the Great) and Marcus Licinius Crassus. When Crassus died after the battle of Carrhae civil war broke out between Caesar and Pompey for control of Rome. In 49 the senate, backing Pompey, ordered Caesar to disband his army and give up his province of Gaul. Instead of giving up, Caesar crossed the Rubicon river setting off a civil war. After a five year struggle accross many battlefields, Caesar defeated his enemies and was sole ruler of Rome.