Chiron

Chiron, according to Greek legend, was one of the Centaurs, the son of Chronos and Philyra. He lived in a cave under Mount Pelion, and was renowned for his skill as an archer and a musician, but still more so for his knowledge of the healing art. He was the instructor of Achilles, Hercules, AEsculapius, Ulysses, Nestor, and many others. Having received an incurable wound in the knee from a poisoned arrow shot by Hercules, he begged Zeus to relieve him of his painful immortality, which was conferred on Prometheus, he himself being translated to the stars as Sagittarius.