Soon after the death of Malcolm the Second the northern districts of Scotland fell under the dominion of the Norwegian Earl of Orkney, while the Celtic _Mormaer_ of Moray reigned in a kingdom the centre of which was at Scone; but when the usurper was expelled by the heir through a female of the ancient line, and Malcolm Ceannmor was established on the throne by the powerful aid of the Angles of Northumberland under their Earl Siward, and the northern districts reverted to his sway on the death of the Norwegian Earl, Saxon influences became predominant; and the new dynasty, still more closely connected with the Saxons through the marriage of its founder with the Saxon Princess Margaret, found its support mainly in the Anglic population of Lothian, which now became the most important province of the extended monarchy. His son Eadgar reigned in reality as a Saxon monarch, and when on his death the kingdom was divided between his brothers Alexander and David, the former consolidated his kingdom north of the Firths of Forth and Clyde upon the basis of Saxon institutions, while the latter ruled over the districts of British Strathclyde and Anglic Lothian as a feudal lord, with Norman sympathies and supported by a powerful following of Norman nobles. During the reigns of Eadgar and Alexander there was a silent advance of Saxon colonisation, and a progressive assimilation of the people to Saxon customs, which led to a Saxon nomenclature being imposed upon their Celtic institutions which found analogous forms in the Saxon laws; and thus in the kingdom of Alexander the First we find the Celtic _Mormaer_ appearing as _Comes_ or Earl, while the name of _Thanus_ or thane was applied to the _Toisech_,[252] and the tribe territory is now termed _Thanagium_ or Thanage. In the British district of Strathclyde the Celtic forms disappeared before the advancing feudalism of David; and when upon the death of his brother he became the first feudal king of all Scotland and its first lawgiver, the constitution of his kingdom was based upon the feudal system; and as its leading principle was that the king was feudal superior of all the territory, and all rights to land emanated from him, all land not given out as feudal holdings was held to be Crown land, and the tribe territories not placed under feudal lords, and now termed Thanages, were regarded as royal demesnes.[253]