Prometheus sided with Zeus and was later chained to a rock, where an eagle tortured him.
Prometheus was a Titan, the son of Iapetus and a brother of Atlas, Epimetheus, and Menoetius. Unlike most of the Titans, he supported Zeus and the Olympians in their struggle against Cronus. The surviving traditions do not describe his role in the war in identical detail, but his allegiance is a standard part of the myth.
Prometheus later angered Zeus by helping humanity. In Hesiod’s account, he deceived Zeus during the division of an ox sacrifice and then stole fire for mortals after Zeus withheld it. Zeus punished him by having him bound to a rock, often located in the Caucasus Mountains.
Each day, an eagle ate his liver; because Prometheus was immortal, it grew back during the night. The hero Heracles eventually killed the eagle and freed him, in accounts associated with later developments of the myth. The story is often confused with the punishment of Tityos, whose liver was attacked by vultures.