In classical Greek mythology, Hercules is assigned twelve superhuman labors to complete. The eighth of these is to capture the man-eating horses of Diomedes, king of Thrace. In most accounts, Hercules subdues and steals the mares, killing Diomedes and feeding him to his own horses. "The sculpture depicted the two heroes of Greek mythology—both stark naked—locked in a wrestling match. Hercules was holding Diomedes upside down, preparing to throw him, while Diomedes was tightly gripping Hercules’ penis, as if to say, “Are you sure you want to throw me?” - Prof. Langdon Dan Brown, Inferno