It began Process_start as a series of political Social_event and military confrontations Hostile_encounter , between Julius Caesar ( 100–44 BC ) , his political supporters ( broadly known as Populares ) , and his legions , against the Optimates ( or `` Boni '' ) , the politically conservative and socially traditionalist faction of the Roman Senate , who were supported Supporting by Pompey ( 106–48 BC ) and his legions .

He and Pompey had , along with Marcus Licinius Crassus , established Creating the First Triumvirate , through which they shared power over Rome .

Pompey fled Escaping Rome and organized Arranging an army in the south of Italy to meet Motion Caesar .

Pompey defeated Conquering Caesar in 48 BC at the Battle Hostile_encounter of Dyrrhachium , but was himself defeated Conquering much more decisively at the Battle Hostile_encounter of Pharsalus .

Pompey fled Escaping to Egypt and was killed Killing upon arrival Arriving .