He established the First Triumvirate with Pompey and Crassus (60), and became consul in 59. Between 58 and 51 he fought the Gallic Wars, invaded Britain (55 54), and acquired immense power. After civil war with Pompey, which ended in Pompey's defeat at Pharsalus (48), Caesar became dictator of the Roman Empire; he was murdered on the Ides (15th) of March in a conspiracy led by Brutus and Cassius.