Slab of the marble frieze from the proskenion of the theater of Delphi with Herakles, Diomedes and Diomedes' horses, dated to the 2nd-1st century BC. Hercules is depicted in the center, drawing away from a horse. On the right, the hero is depicted again striking down a figure, probably Diomedes, who is on his knees, fully clothed and raising one hand to Herakles.