Res Gestae

Diocletian ruled with Herculius[*](This name was conferred on Maximianus by Diocletian.) Maximianus for twenty years.

Constantius,[*](Constantius Chlorus, father of Constantine, emperor 305–306.) grandson of the brother of that best of emperors Claudius,[*](Claudius II.; his mother was Claudia, daughter of Crispus, brother of Claudius II; cf. Eutr. ix. 22; Hieron. a. Abr. 2307.) was first one of the emperor’s bodyguard, then a tribune, and later, governor of Dalmatia.[*](Under the emperor Carus, who wished to make him Caesar in place of his own brother Carinus.) With Galerius he was appointed Caesar by Diocletian[*](In 292.) ; for he put away his former wife Helena and married Theodora, daughter of Maximianus, by whom he afterwards had six children,[*](Three sons: Dalmatius, Julius Constantius, and Hannibalianus; and three daughters: Constantia, Anastasia, and Eutropia.) brothers of Constantine. But by his former wife Helena he already had a son Constantine, who was later the mightiest of emperors.