Prometheus is a Titon from Greek Mythology who is credited with the creation of man from clay as well as the theft of fire for human use. He is known for his intellegence and as a champion of humanity
Prometheus was punished by Zues for stealing fire from the gods. He was chained to a rock where an eagle would eat his liver, only to have it regrow and eaten again, everyday, for eternity. In many forms of the myth Prometheus is eventually rescued by Heracles.
This punishment is a popular subject in both ancient and modern art.