But while the eastern and central tribes became broken up by the termination of the line of the Celtic earls of the respective great districts or _Mortuaths_, and thus either reverting to the Crown or passing by marriage to Norman barons, those of the western seaboard and of the Isles were held together for a longer period, and remained intact till towards the end of the fifteenth century. These Gaelic inhabitants of the Western Isles had been, as early as the ninth century, brought under the rule of the Danes and Norwegians, and the latter had in the eleventh century extended their sway over the western districts of the highlands and over Galloway. These Gael were termed _Gallgaidheal_, the word _Gall_ or foreigner being applied to both Danes and Norwegians, both from being under their rule and from their having been in some degree assimilated to their manners and become connected with them by intermarriage; but the word _Gallgaidheal_ as a geographical term became limited to the district of Galloway, which derived its name from them. The Islands became known as _Innsigall_, or the islands of the strangers, and western districts of the Highlands as _Airer_ or _Oirir Gaidheal_, the coast land of the Gael, from whence the name of Argyll is derived. Two Celtic chiefs, as we have seen, succeeded at the same time in driving the Norwegians out from the mainland of Scotland, and Somerled, establishing himself as king over the whole of the extensive district known by the name of Ergadia or _Oirirgaidheal_, extending from the Clyde to Lochbroom, and had likewise wrested from the Norwegian kings of the Isles the southern half of them lying to the south of the promontory of Ardnamurchan, over which his descendants ruled with almost regal sway, while Fergus founded a line of Celtic lords of Galloway. Somerled left three sons—Dubhgal or Dugald, Reginald, and Angus, among whom his dominions were divided. Dubhgal received the district of Lorn, extending from Lochleven to the Point of Ashnish, and also that of Morvern; Reginald obtained the districts of Kintyre and Cowall, and the islands which Somerled had possessed were divided between them, Dubhgal having Mull and the small islands adjacent to it, and Reginald the important island of Isla, with those in the Firth of Clyde. Angus’s possessions appear to have lain north of the others, but a struggle seems to have taken place between him and Reginald, which resulted in Angus being slain with his three sons in 1210 by the sons of Reginald. Soon after, the conquest of the great district of Argyll by Alexander the Second took place, and the descendants of Somerled appear to have been among the lords who were confirmed in their possessions by that monarch, but their possessions in the Isles were still held of the Norwegians till the cession of the Isles in the reign of Alexander the Third. Reginald had left two sons, Donald and Ruaidri or Roderick, the