In Greek mythology, Oenope or Oinope (Ancient Greek: Οινόπη) was a Sicyonian princess as daughter of King Epopeus[1] and possibly Antiope of Thebes, thus sister to King Marathon of Corinth.[2] She was the mother of King Megareus of Onchestus by the sea god Poseidon.[1] Otherwise, the parentage of Megarus can be attributed to Onchestus,[3] Apollo, Aegeus[4] or Hippomenes.[5]