Cnut's greatest gift to his people was that of peace. With him began the long internal tranquillity which was from this time to be the keynote of the national history. Without, the Dane was no longer a terror; on the contrary it was English ships and English soldiers who now appeared in the North and followed Cnut in his campaigns against Wend or Norwegian. Within, the exhaustion which follows a long anarchy gave fresh strength to the Crown, and Cnut's own ruling temper was backed by the force of hus-carls at his disposal. The four Earls of Northumberland, Mercia, Wessex, and East-Anglia, whom he set in the place of the older caldormen, knew themselves to be the creatures of his will; the ablest indeed of their number, Godwine, earl of Wessex, was the minister or close counsellor of the King. The troubles along the Northern border were ended by a memorable act of policy. From Eadgar's day the Scots had pressed further and further across the Firth of Forth till a victory of their king Malcolm over Earl Eadwulf at Carham in 1018 made him master of Northern Northumbria. In 1031 Cnut advanced to the North, but the quarrel ended in a formal cession of the district between the Forth and the Tweed, Lothian as it was called, to the Scot-king on his doing homage to Cnut. The gain told at once on the character of the Northern kingdom. The kings of the Scots had till now been rulers simply of Gaelic and Celtic peoples; but from the moment that Lothian with its English farmers and English seamen became a part of their dominions it became the most important part. The kings fixed their seat at Edinburgh, and in the midst of an English population passed from Gaelic chieftains into the Saxon rulers of a mingled people. [Sidenote: Cnut's Sons]