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
Temple of the Feathered Serpent, Teotihuacan of Teotihuacán within its walls, which was estimated to be one hundred thousand people at its peak. Within the Ciudadela there are several monumental structures, including the temple, two mansions north and south of the temple, and the Adosada platform. Built in the 4th century, the Adosada platform is located just in front (west) of the Temple of the Feathered Serpent, obscuring its view. The Feathered Serpent Pyramid is a six-level step pyramid built in the talud-tablero style. The outside edges of each level are decorated with feathered serpent heads alternating with those of another snake-like creature, often identified as