HESPERUS, the evening star, son or brother of Atlas [Gr. ; Lat. Vesper]. Although as a mythological personality he is regarded as distinct from Phosphoros or Heosphoros (Lat. Lucifer), the morning star or bringer of light, the son of Astraeus (or Cephalus) and Eos, the two stars were early identified by the Greeks.
See Diog. Laert. viii. I. 14.; Cicero, De nat deorum ii. 20; Pliny, Nat. Hist. ii. 6 [8].