Prometheus was the son of Iapetus who was one of the Titans. He tricked the gods into eating bare bones instead of good meat. He stole the sacred fire from Zeus and the gods. Prometheus did not tell Zeus the prophecy that one of Zeus’s sons will overthrow him. In punishment, Zeus commanded that Prometheus be chained for eternity in the Caucasus. There, an eagle (or, according to other sources, a vulture) would eat his liver, and each day the liver would be renewed. So the punishment was endless, until Heracles finally killed the bird.