Eos (Ionic and Homeric Greek: Ἠώς, "Ēōs"; Attic: Ἕως, "Éōs"; Aeolic: Αὔως, "Aúōs"; Doric: Ἀώς, "Āṓs") is the goddess of the dawn in Greek mythology. She was the daughter of the Titans Hyperion and Theia. She is the sister of Helios, god of the sun, and Selene, goddess of the moon.