According to this GamePolitics piece, both Sony and David Jaffe have been sued for alleged copyright infringment involving God of War. From the piece:
The suit was filed in late February by Jonathan Bissoon-Dath and Jennifer Barrette-Herzog, both of Davis, California. SCEA and Jaffe filed responses with the Court on August 29th.
In the complaint, Bissoon-Dath identifies himself as "the author of a series of related works of fiction, including Olympiad, a screenplay." Barrette-Herzog is described as the creator of Island at the Edge of the Living World, "a map that was submitted with Bissoon-Dath's work: The Adventures of Own: Owen's Olympic Adventure."
The plaintiffs allege that in 2002 they sent their work to Sony Pictures as well as agents who also did business with SCEA. Bissoon-Dath and Barrette-Herzog note that the original God of War shipped in 2005 and that David Jaffe apparently said at some point that the game had taken three years to develop.
More through there.