166. Gallienus had given the titles of Caesar and Augustus
to his son Saloninus, slain at Cologne by the usurper
Posthumus. A second son of Gallienus succeeded to the name
and rank of his elder brother. Valerian, the brother of
Gallienus, was also associated to the empire: several other
brothers, sisters, nephews, and nieces of the emperor,
formed a very numerous royal family. Tillemont, tom. iii.
and M. de Brequigny in the Memoires de l'Academie, tom.
xxxii. p. 262.