Apollo was the son of the god Zeus and Leto, daughter of a Titan. He also bore the epithets "Delian" from Delos, the island of his birth, and "Pythian," from his killing of the Python, the fabled serpent that guarded a shrine on the slopes of Mount Parnassus. In Homeric legend Apollo was primarily a god of prophecy. His most important oracle was at Delphi, the site of his victory over the Python. He sometimes gave the gift of prophecy to mortals whom he loved, such as the Trojan princess Cassandra. He was also a master archer and a fleet-footed athlete, credited with having been the first victor in the Olympian Games.