The nine centuries, above referred to, of Roman invasion, intestine war, and ecclesiastical rivalry between the Pictish, Columban and Catholic Churches had now, under Malcolm II, produced a kingdom of Scotland, throughout which the Catholic was in a fair way to become the predominant Church, and in which the authority of the Scottish Crown was for the time being, nominally, but in the north merely nominally, supreme on the mainland from the Tweed to the Pentland Firth. The Isles of Orkney and Shetland and the whole of the Sudreyar or Hebrides, however, owed allegiance, whether their jarls admitted it or not, to the Crown of Norway, and the Scottish kings had no authority over them.[40] Moreover, the Northmen--Danes and Norsemen and Gallgaels--held the western seas from the Butt of Lewis to the Isle of Man, and they had severed the connection between the Scots of Ulster and the Scots of Argyll. The latter had thus been forced to move eastwards, in order to avoid constant raids by the Irish Danes and Norsemen and the Gallgaels, who thus possessed themselves of all the coast of Scotland then known as Airergaithel or Argyll, which extended up to Ross and Assynt, west of the Drumalban watershed. Of the next nine centuries from 1000 to the present time it is proposed to deal with the first two hundred and seventy years only, which, with the preceding century and a half, form a chapter of Scottish history complete in itself. The narrative, as already stated, will be based largely upon the great Stories or Tales known as the _Orkneyinga, St. Magnus'_, and _Hakonar Sagas_, and also upon Scottish and English chronicles and records so far as they throw their fitful light upon the northern counties of Scotland, and especially upon Caithness and Sutherland, during the dark periods between these Sagas.