In the end of the fifth century and the beginning of the sixth, a new settlement of Goidels was made. These were the Scots, who founded the kingdom of Dalriada, corresponding roughly to the Modern Argyllshire. Some fifty years later (_c._ 547) came the Angles under Ida, and established a dominion along the coast from Tweed to Forth, covering the modern counties of Roxburgh, Berwick, Haddington, and Midlothian. Its outlying fort was the castle of Edinburgh, the name of which, in the form in which we have it, has certainly been influenced by association with the Northumbrian king, Edwin.[30] This district remained a portion of the kingdom of Northumbria till the tenth century, and it is of this district alone that the word "English" can fairly be used. Even here, however, there must have been a considerable infusion of Celtic blood, and such Celtic place-names as "Dunbar" still remain even in the counties where English place-names predominate. A distinguished Celtic scholar tells us: "In all our ancient literature, the inhabitants of ancient Lothian are known as Saix-Brit, _i.e._ Saxo-Britons, because they were a Cymric people, governed by the Saxons of Northumbria".[31] A further non-Celtic influence was that of the Norse invaders, who attacked the country from the ninth to the eighteenth century, and profoundly modified the racial character of the population on the south and west coasts, in the islands, and along the east coast as far south as the Moray Firth. Such, then, was the racial distribution of Scotland. Picts, Goidelic Celts, Brythonic Celts, Scots, and Anglo-Saxons were in possession of the country. In the year 844, Kenneth MacAlpine, King of the Scots of Dalriada, united under his rule the ancient kingdoms of the Picts and Scots, including the whole of Scotland from the Pentland Firth to the Forth. In 908, a brother of the King of Scots became King of the Britons of Strathclyde, while Lothian, with the rest of Northumbria, passed under the overlordship of the House of Wessex. We have now arrived at the commencement of the long dispute about the "overlordship". We shall attempt to state the main outlines as clearly as possible.