In Greek and Roman mythology, Glaucus (/ˈɡlɔːkəs/; Ancient Greek: Γλαῦκος Glaukos means "greyish blue" or "bluish green" and "glimmering"), usually surnamed as Potnieus, was a son of Sisyphus whose main myth involved his violent death as the result of his horsemanship. He was the king of the Boeotian city of Potniae or sometimes of Corinth.[1] Glaucus was the subject of a lost tragedy by Aeschylus, Glaucus Potnieus (Glaucus at Potniae),[2] fragments of which are contained in an Oxyrhynchus Papyrus.[3]