In the play, Prometheus, the Titan, had assisted Zeus in establishing rule over Cronus and the other Titans, but infuriated Zeus by becoming the champion of mortals and giving them fire and the arts. In the opening of the play, Zeus ordered Hephaestus, Kratos (Power) and Bia (Force) to nail Prometheus to a high rock in Caucasus, to suffer torment as long as Zeus wishes. Prometheus's punishment is for stealing fire from Mount Olympus to give to humanity. Zeus, the King of Olympians, ordered Prometheus to be chained to a rock and suffer torment, by having an eagle devour Prometheus's perpetually regenerating liver everyday.