In Greek mythology, Prometheus (Greek: Προμηθεύς, pronounced [promɛːtʰeús]) is a Titan, culture hero, and trickster figure who is credited with the creation of man from clay, and who defies the gods and gives fire to humanity (theft of fire), an act that enabled progress and civilization. He is known for his intelligence and as a champion of mankind.The punishment of Prometheus as a consequence of the theft is a major theme of his mythology, and is a popular subject of both ancient and modern art. Zeus, king of the Olympian gods, sentenced the Titan to eternal torment for his transgression. The immortal Prometheus was bound to a rock, where each day an eagle, the emblem of Zeus, was sent to feed on his liver, which would then grow back to be eaten again the next day. (In ancient Greece, the liver was thought to be the seat of human emotions.) In some stories, Prometheus is freed at last by the hero Heracles (Hercules).In another of his myths, Prometheus establishes the form of animal sacrifice practiced in ancient Greek religion. Evidence of a cult to Prometheus himself is not widespread. He was a focus of religious activity mainly at Athens, where he was linked to Athena and Hephaestus, other Greek deities of creative skills and technology.In the Western classical tradition, Prometheus became a figure who represented human striving, particularly the quest for scientific knowledge, and the risk of overreaching or unintended consequences. In particular, he was regarded in the Romantic era as embodying the lone genius whose efforts to improve human existence could also result in tragedy: Mary Shelley, for instance, gave The Modern Prometheus as the subtitle to her novel Frankenstein (1818).