Nemean Games
The infant Opheltes, killed by a serpent, is part of the story of the Seven against Thebes, and the origin of the Nemean Games. On their way to Thebes, the Seven, in need of water, stop at Nemea, where they encounter Hypsipyle, who is the nurse of Opheltes. While helping the Seven to get water, Hypsipyle sets Opheltes down, and he is killed by a serpent. The Seven kill the serpent, and the seer Amphiaraus, one of the Seven, renames the child Archemorus, meaning the "Beginning of Doom", interpreting the child's death as a harbinger of the Seven's own impending doom at Thebes. The Seven hold funeral games in the child's honor, which become the origin of the Nemean Games.