But the seeming submission of the North was fallacious. The Danes had reintroduced into Britain a fresh mass of incoherent barbarism, which could not thus readily coalesce. The Scandinavian leaven in the population had put back the shadow on the dial of England some three centuries. Æthelstan, Eadward's son, found himself obliged to give his sister in marriage to Sihtric or Sigtrig, Danish king of the Yorkshire Northumbrians, which probably marks a recognition of his vassal's equality. Soon after, however, Sihtric died, and Æthelstan made himself first king of all England by adding Northumbria to his own immediate dominions. Then "he bowed to himself all the kings who were in this island; first, Howel, king of the West Welsh; and Constantine, king of Scots; and Owen, king of Gwent [South Wales]; and Ealdred, son of Ealdulf of Bamborough; and with pledge and with oaths sware they peace, and forsook every kind of heathendom." In the West, he drove the Welsh from Exeter, which they had till then occupied in common with the English, and fixed their boundary at the Tamar. But once more the pretended vassals rebelled. Constantine, king of Scots, threw off his allegiance, and Æthelstan thereupon "went into Scotland, both with a land host and a ship host, and harried a mickle deal of it." In 937, the feudatories made a final and united effort to throw off the West Saxon yoke. The Scots, the Strathclyde Welsh, the people of Wales and Cornwall, the lords of Bamborough, and the Danes throughout the North and East, all rose together in a great league against their over-lord. Anlaf, king of the Dublin Danes, came over from Ireland to aid them, with a large body of wickings. The confederates met the West Saxon _fyrd_ or levy at an unknown spot named Brunanburh, where Æthelstan overthrew them in a crushing defeat, which forms the subject of a fine war-song, inserted in full in the English Chronicle.[1] Three years later Æthelstan died, as his father had died before him, undisputed over-lord of all Britain, and immediate king of the whole Teutonic portion. [1] See chapter xx.