Chiron
Χείρων
The one wise centaur, who raised the heroes.
While most centaurs were savage, Chiron was a teacher skilled in medicine, music, and the hunt.
Achilles, Jason, and Asclepius were all his pupils.
Struck by mistake with one of Heracles's poisoned arrows, he could not even die, being immortal — until at last he passed his immortality to Prometheus and let go.