Apollo taught to the humans the art of healing and archery. Phoebe, his grandmother, gave the oracular shrine of Delphi to Apollo as a birthday gift. Themis inspired him to be the oracular voice of Delphi thereon. Later, with his bow and arrows that he had received from Hephaestus, Apollo went in search of the chthonic dragon Python, which lived in Delphi beside the Castalian Spring, and was a terror to the people. Hera had sent this serpent to hunt the pregnant Leto to her death across the world. To avenge the trouble given to his mother, Apollo killed Python in
Snake worship Laocoön and his two sons, Antiphantes and Thymbraeus. Another tradition states that Apollo sent the serpents for an unrelated offense, and only unlucky timing caused the Trojans to misinterpret them as punishment for striking the Horse. Olympias, the mother of Alexander the Great and a princess of the primitive land of Epirus, had the reputation of a snake-handler, and it was in serpent form that Zeus was said to have fathered Alexander upon her; tame snakes were still to be found at Macedonian Pella in the 2nd century AD (Lucian, "Alexander the false prophet") and at Ostia a bas-relief shows