Only once more did the Romans make any endeavour to complete the subjection of Britain by adding the Gaelic tribes of the Scottish Highlands to the list of their tributaries. In 208-9-10 the warlike emperor Severus led the legions north of the Wall of Antoninus, and set to work to tame the Caledonians by felling their forests, building roads across their hills, and erecting forts among them. He overran the land beyond the Firth of Forth, and might perchance have ended by conquering the whole island, but he died of disease at York early in 211. His successors drew back, abandoned his conquests, and never attempted again to subjugate the Caledonians. [Sidenote: =Roman civilization in Britain.=] Altogether the Romans abode in Britain for three hundred and sixty years (A.D. 43 to A.D. 410). Their occupation of the land was mainly a military one, and they never succeeded in teaching the mass of the natives to abandon their Celtic tongue, or to take up Roman customs and habits. The towns indeed were Romanized, and great military centres like Eboracum and Deva, or commercial centres like London, were filled with a Latin-speaking population, and boasted of fine temples, baths, and public buildings. But the villagers of the open country, and the Celtic landholders who dwelt among them, were very little influenced by the civilization of the town-dwellers, and lived on by themselves much in the way of their ancestors, worshipping the same Celtic gods, using the same rude tools and vessels, and dwelling in the same low clay huts, though the townsmen were accustomed to build stone houses after the Roman fashion, to employ all manner of foreign luxuries, and to translate into Minerva, or Apollo, or Mars, the names of their old Celtic deities Sul, or Mabon, or Belucatadrus. [Illustration: ROMAN BRITAIN =SHOWING THE CHIEF ROMAN ROADS.=]