In Greek mythology, Python was the earth-dragon of Delphi, always represented in Greek sculpture and vase-paintings as a serpent. He presided at the Delphic oracle, which existed in the cult center for his mother, Gaia, "Earth," Pytho being the place name that was substituted for the earlier Krisa. Hellenes considered the site to be the center of the earth, represented by a stone, the omphalos or navel, which Python guarded.
Python became the chthonic enemy of the later Olympian deity Apollo, who slew him and remade Python's former home and the oracle, the most famous in Classical Greece, as his own. Changes such as these in ancient myths may reflect a profound change in the religious concepts of Hellenic culture. Some were gradual over time and others occurred abruptly following invasion.