 As with the previous games in the God of War franchise , God of War : Betrayal is set in an alternate version of ancient Greece , populated by the Olympian Gods and other beings of Greek mythology . Events are set between those of the games Ghost of Sparta ( 2010 ) and God of War II ( 2007 ) . The protagonist is Kratos , a former Captain of Sparta 's army who became the new God of War after killing his predecessor , Ares , the previous God of War . Other characters include Argos , the giant pet of the goddess Hera ; an unknown assassin ; and the Olympian messenger Ceryx , the son of Hermes and main antagonist . Zeus , the King of the Gods , is an unseen character . 
