Gnaeus Pompeius (ca. 75 BC – April 12, 45 BC), also known as Pompey the Younger (sometimes spelled Cneius, Gneius), was a Roman politician and general from the late Republic (1st century BC). Gnaeus Pompeius was the elder son of Pompey the Great (Gnaeus Pompeius Magnus) by his third wife, Mucia Tertia. Both he and his younger brother Sextus Pompey grew up in the shadow of their father, one of Rome's best generals and not originally a conservative politician who drifted to the more traditional faction when Julius Caesar became a threat. When Caesar crossed the Rubicon in 49 BC, thus starting a civil war, Gnaeus followed his father in their escape to the East, as did most of the conservative senators. Pompey's army lost the Battle of Pharsalus in 48 BC, and Pompey himself had to run for his