In Greek and Roman mythology, Glaucus (/ˈɡlɔːkəs/; Ancient Greek: Γλαῦκος Glaukos means "greyish blue" or "bluish green" and "glimmering") was a son of Sisyphus whose main myth involved his violent death as the result of his horsemanship. He was a king of Corinth and the subject of a lost tragedy by Aeschylus, Glaucus Potnieus (Glaucus at Potniae), fragments of which are contained in an Oxyrhynchus Papyrus.