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 the sky as the constellation Ophiucus, "the Serpent-Bearer". The modern symbol of medicine is the rod of Asclepius, a snake twining around a staff, while the symbol of pharmacy is the bowl of Hygieia, a snake twining around a cup or bowl. Hygieia was a daughter of Asclepius. Laocoön was allegedly a priest of Poseidon (or of Apollo, by some accounts) at Troy; he was famous for warning the Trojans in vain against accepting the Trojan Horse from the Greeks, and for his subsequent divine execution. Poseidon (some say Athena), who was supporting the Greeks, subsequently sent sea-serpents to strangle