Kratos is the main protagonist and hero of the God of War series. Born a Spartan, Kratos held the military rank of General, before exacting his revenge on the Olympians who betrayed him.
He becomes the "Ghost of Sparta" after accidentally killing his family on behalf of Ares' trickery. He becomes the God of War after killing Ares, and is eventually revealed to be a demigod and the son of Zeus, who betrays Kratos. Each adventure forms part of a saga with vengeance as a central theme, providing additional information about Kratos' origins and his relationships with his family and the gods.