Hesperus, in Greco-Roman mythology, the evening star; although initially considered to be the son of Eos (the Dawn) and the Titan Astraeus, he was later said to be the son or brother of Atlas. He was later identified with the morning star, Phosphorus, or Eosphorus (Latin: Lucifer), the bringer of light (later discovered by astronomers to be the planet Venus). Hesperus is variously described by different authors as the father of the Hesperides (the guardians of the golden apples) or of their mother, Hesperis.