Roman marble relief, c. AD 140-150. Aeneas and his son Ascanius finding the white sow with thirty piglets, the omen which marks the location of the future Alba Longa, founded by Ascanius after thirty years. British Museum, London. Ecce autem subitum atque oculis mirabile monstrum; candida per silvam cum fetu concolor albo procubuit viridique in litore conspicitur sus. Quam pius Aeneas tibi enim, tibi, maxuma Iuno, mactat sacra ferens et cum grege sistit ad aram. Vergil, Aeneid, VIII, 81-85.