Prometheus: From Greek mythology, he was the son of Iapetos and helped all humans by bringing fire, according to the Theogony. He tried to trick Zeus by offering, as the first sacrifice, the worst part of the meat; to retaliate, Zeus hid fire, but Prometheus stole it for people to use. Prometheus was punished by being tied up and having an eagle eat his liver each day, but it grew back each night. He was eventually freed by Heracles, according to Elizabeth Vandiver, Classics scholar and authority on Greek mythology and Greek tragedy including the Iliad, Odyssey, Aeneid, Homer, and Virgil. This definition is based on her course Classical Mythology from The Teaching Company.