Thus all agree in distinguishing between the simple and rude inhabitants of the interior, who were considered to be indigenous, and the more civilised people of the eastern and southern shores who were believed to have passed over from Gaul. [Sidenote: A.D. 43. Formation of province in reign of Claudius.] It was not till the reign of Claudius that any effectual attempt was renewed to subject the British tribes to the Roman yoke; but the second conquest under that emperor speedily assumed a more permanent character than the first under Julius Cæsar, and the conquered territory was formed into a province of the Roman empire. During this intervening period of nearly a century, we know nothing of the internal history of the population of Britain; but the indications which have reached us of a marked and easily-recognised distinction between two great classes of the inhabitants, and of the progressive immigration of one of them from Belgium, and the analogy of history, lead to the inference that during this period—ample for such a purpose—the stronger and more civilised race must have spread over a larger space of the territory, and the ruder inhabitants of the interior been gradually confined to the wilder regions of the north and west. The name of Britannia having gradually superseded the older appellation of Albion, and the latter, if it is synonymous with Alba or Alban, becoming confined to the wilder regions of the north, lead to the same inference. As soon as the conquests of the Romans in Britain assumed the form of a province of the empire, all that they possessed in the island was termed ‘Britannia Romana,’ all that was still hostile to them, ‘Britannia Barbara.’ The conquered tribes became the inhabitants of a Roman province, subject to her laws, and sharing in some of her privileges. The tribes beyond the limits of the province were to them ‘Barbari.’ An attention to the application of these terms affords the usual indication of the extent of the Roman province at different times, and, if the history of the more favoured southern portion of the island must find its earliest annals in the Roman provinces of Britain, it is to the ‘Barbari’ we must turn in order to follow the fortunes of the ruder independence of the northern tribes. It will be necessary, therefore, for our purpose, that we should trace the gradual extension of the boundary of the Roman province and the advance of the line of demarcation between what was provincial and what was termed barbarian, till we find the independent tribes of Britain confined within the limits of that portion of the island separated from the rest by the Firths of Forth and Clyde.