Themisto (Ancient Greek: Θεμιστώ), daughter of Hypseus, was the third and last wife of Athamas. According to some sources, she had four children by him: Leukon, Erythrius, Skhoeneus, and Ptous. In other sources there were but two: Sphinkius and Orchomenus, or else Skhoeneus and Leuk. Some say that the father of Leukon was Poseidon (see also Leukonoe).