The king of Sicyon. He married with Antiope, the daughter of King Nycteus of Thebes. Nycteus' attempts to get his daughter back were unsuccessful and upon his deathbed he asked his brother Lycus to return. Lycus marched with an army to Sicyon. The city was destroyed and Epopeus was killed; Antiope was taken back to Thebes and put into the care of Dirce, Lycus' wife, who mistreated her severely.