CONSTA'NTIUS I., called CHLORUS, on account of hie habitual paleness, son of Entropies, of a distinguished Illyrian family, and of Claudia, niece of the Emperor Claudius IL, was born about 250. He served with distinction under Aurelian, Probus, and Diocletian. In the year 291 Maxi:ohms, the colleague of Diocletian, named him Carer and his colleague, while Diocletian chose on his side Gelerius : the administration of the empire was divided among the four. Constantius had for his share the Gauls, Spain, and Britain. Both the new Cwears were obliged to repudiate their wives. Constantine, whose first wife was Helena, the mother of Constantine, married Theodora, daughter of Maximianus; Galerius married Valeria, daughter of Diocletian. Constantino carried on war against the Franks, who began to be troublesome on the Lower Rhine, and took a vast number of thorn prisoners. Ile restored the town of Augustodunum (Autun), which had been devastated by Tetricne, one of the thirty tyrants. Ho then repaired to Britain, with Aselepiadotus, one of his lieutenants, who defeated Allectus (300), the successor of Caraunius in the usurped dominion of the island. Britain was thus restored to the empire after a revolt of ten years. On his return to Gaul, Constantine wont against the Alemanni, whom he defeated with great slaughter near Vindoolasa in Helvetia, some say near Langres, and drove them beyond the Rhine.
About this time he founded the town of Coustantia (Conetanz). In the year 304 the two emperors, with the two Caesars, came to Rome, where they enjoyed the honour of a triumph. In the following year Diocletian and Ifaximianua abdicated, and appointed Constautius and Galerins their successors, who in their turn appointed two new Ccesars as their colleagues, namely, Severna and Maximinus Dabs, or Dana. Constantius continued to administer his old government of Gaul, Spain, and Britain. Ills administration, which was equitable and humane, is greatly praised by the historians, both Christian and heathen. He put a stop to the persecutions against the Christiana, and employed many of them about his person. The last campaign of Constantius was against the Caledonians, some say against the Picta, whom he defeated. lie died soon after at Eboracum (York), July 25, 306, in the arms of hie son Constantine, whom he appointed his successor, 300. B7 his second wife Theodora, Constantine left several children Dalmatms ; Julius Conetantius, who was the father of Constantine Oallue and of Julian the Apostate; and Coustantia, afterwards married to LIcinins.