Roman general, statesman, and historian who invaded Britain (55), crushed the army of his political enemy Pompey (48), pursued other enemies to Egypt, where he installed Cleopatra as queen (47), returned to Rome, and was given a mandate by the people to rule as dictator for life (45). On March 15 of the following year he was murdered by a group of republicans led by Cassius and Brutus, who feared he intended to establish a monarchy ruled by himself.