Prometheus is the Titan of crafty counsel and forethought. He is known for giving humans the gift of fire. He is the son of Iapetus and Clymene and the brother-in-law of Pandora.
Prometheus sided with the gods in the first Titan War because he knew that the Titans would lose. As a result, he was not imprisoned. However, because of his meddling nature, he stole fire for humans, which boosted their progress as a species. He had already deceived Zeus prior to then by making him choose the worst part of an ox and giving the best one to humanity. These two actions, (more the fire than the ox) made Zeus angry and as a punishment, Zeus had Prometheus chained up on a mountain and had a vulture peck out his liver every day, and as Prometheus' liver regrew every night, the cycle could continue. This could only be evaded if someone broke the chains or if Prometheus told Zeus which of his fellow gods would overthrow him. Prometheus was later freed by Heracles who also slew the vulture, with the permission of his father Zeus.