In the later period of the empire, no doubt, it fell behind Treves. The town of the Treveri, named Augusta probably from the first emperor, soon gained the first place in the Belgic province; if still in the time of Tiberius Durocortorum of the Remi (Rheims) is named the most populous place of the province and the seat of the governors, an author from the time of Claudius already assigns the primacy there to the chief place of the Treveri. But Treves became the capital of Gaul[44]--we may even say of the West--only through the remodelling of the imperial administration under Diocletian. After Gaul, Britain, and Spain were placed under one supreme administration, the latter had its seat in Treves; and thenceforth Treves was also, when the emperors stayed in Gaul, their regular residence, and, as a Greek of the fifth century says, the greatest city beyond the Alps. But the epoch when this Rome of the north received its walls and its hot baths, which might well be named by the side of the city walls of the Roman kings and of the baths of the imperial capital, lies beyond the limits of our narrative. Through the first three centuries of the empire Lyons remained the Roman centre of the Celtic land, and that not merely because it occupied the first place in population and wealth, but because it was, like no other in the Gallic north and but few in the south, a town founded from Italy, and Roman not merely as regards rights, but as regards its origin and its character. [Sidenote: The cantonal organisation of the three Gauls.]