In Greek mythology, Lycus or Lykos (/ˈlaɪkəs/ LY-kəs; Ancient Greek: Λύκος, romanized: Lúkos, lit. 'wolf') was a ruler of the ancient city of Ancient Thebes (Boeotia). His rule was preceded by the regency of Nycteus and in turn, Lycus was succeeded by the twins Amphion and Zethus.