Chiron represented ancient wisdom.
Chiron was half human, half horse: a Centaur. He was friendly to both humans and gods, a very rare thing in centaurs, who were usually turbulent creatures known for their violence and vulgarity during their frequent drunkenness. Chiron was an exception in another way, as well: he was known for his wisdom, kindness, and good behavior. He taught many pupils, including Jason the Argonaut, Achilles, Heracles (Hercules), Theseus, and Aesculapius, god of healing. He was also something of a fortune teller as he could read individuals’ fortunes in the stars.
One day, during a skirmish with the centaurs, Heracles accidentally hit Chiron with one of his arrows, the head of which was covered in the poisoned blood of Hydra, the water serpent with multiple heads. Chiron could not die as he was immortal; however, he could not be nursed back to health, either. He would either be condemned to everlasting pain, or bestow his immortality upon a mortal and die. He chose the latter, and gave his immortality to Prometheus. After his death, Zeus made Chiron part of the Sagittarius (Centaurus) constellations.