The Centaur's are half man, and half horse. They have the body of a horse but, in place of the horse's head the have the torso, head and arms of a man. Most are wild and savage, known for lustfulness and drunkeness. The exception is the wise Centaur Chiron.
Chiron was known for his exceptional goodness and wisdom. He was the only immortal centaur. He became the tutor for a number of famous greek heros including: Achilles, Aesculapius, Actaeon.
Despite his immortality he was to end up dying. Hercules stopped to vist Pholus. Hercules was thirsty and persuaded Pholus to open a jar of wine that was the common property of the centaurs. The other centaurs smelled the wine and came running. A fight broke out between Hercules and the centaurs. Chiron took no part in the fight but, was accedentally wounded by Hercules. As an immortal Chiron could not die but, lived in terrible pain.
Chiron then chose to trade his life for the release of Prometheus.