In the year 925, the Anglo-Saxon Chronicle informs us that Athelstan and Sihtric (or Sigtryg), king of the North-humbrians, "came together at Tamworth, on the 3rd before the Kalends of February; and Athelstan gave him his sister." But this marriage failed to secure the proposed future alliance between the Scandinavian and Anglo-Saxon sovereigns. The Dane, who had embraced Christianity, relapsed into the faith of his forefathers and returned his wife to her former home. Sihtric's death, however, intervened between the repudiation of Queen Editha, who afterwards became Abbess of Tamworth, and the vengeance of Athelstan, which fell upon Anlaf and Godefrid, sons of Sihtric by a former marriage. Anlaf fled to Ireland, on the east coast of which the Danes held the supreme authority, and his brother sought refuge with Constantine, king of the Scots. Referring to these events the Anglo-Saxon Chronicle says--"A. 926. This year fiery lights appeared in the north part of the heavens. And Sihtric perished; and king Athelstan obtained the kingdom of the North-humbrians. And he ruled all the kings who were in the island; first, Howel, king of the West-Welsh; and Constantine, king of the Scots; and Owen, king of the Monmouth people; and Aldred, son of Ealdulf, of Bambrough: and they confirmed the peace by pledge, and by oaths, at the place which is called Eamot, on the 4th before the Ides of July; and they renounced all idolatry, and after that submitted to him in peace." But the peace was not of very long duration, for the king of the Scots raised the standard of revolt, and the old Chronicler, or perhaps a successor, tells us that in the year 933, "Athelstan went into Scotland, as well with a land army as with a fleet, and ravaged a great part of it." This defeat of the Scottish king for a time restored Athelstan's dominion, but the peace which followed was, four years afterwards, broken by a powerful combination of Athelstan's enemies, which shook the "overlordship" of the English monarch to its foundation, and threatened the safety of his inherited kingdoms. The Scots, the Cumbrian Britons, the North and West Welsh, entered into a league with Anlaf of Dublin and the Danish chiefs of Northumbria and their Scandinavian allies to lower the prestige of the English monarch, and to seat the son of Sihtric on the throne of his ancestors. This fierce conflict culminated in the great battle of Brunanburh, in the year 937, in which, after a desperate two days' struggle, the confederate forces of his enemies were utterly routed, and Athelstan reigned supreme monarch to the end of his kingly career.