In January of 49 BC, Julius Caesar led his army across the Rubicon River in Northern Italy (see Caesar Crosses the Rubicon, 49 BC) and plunged the Roman Republic into civil war. Caesar's rival, Pompey, fled to Greece. Within three months Caesar controlled the entire Italian peninsula and in Spain had defeated the legions loyal to Pompey.Caesar now pursued Pompey to Greece. Although outnumbered, Caesar crushed the forces of his enemy but not before Pompey escaped to Egypt. Following Pompey to Egypt, Caesar was presented with his rival's severed head as a token of friendship. Before leaving the region, Caesar established Cleopatra as his surrogate ruler of Egypt. Caesar defeated his remaining rivals in North Africa in 47 BC and returned to Rome with his authority firmly established.Caesar continued to consolidate his power and in February 44 BC, he declared himself dictator for life. This act, along with his continual effort to adorn himself with the trappings of power, turned many in the Senate against him. Sixty members of the Senate concluded that the only resolution to the problem was to assassinate Caesar.