By the treaty of Northampton which was solemnly confirmed by Parliament in September the independence of Scotland was recognized, and Robert Bruce owned as its king.

Edward formally abandoned his claim of feudal superiority over Scotland; while Bruce promised to make compensation for the damage done in the North, to marry his son David to Edward's sister Joan, and to restore their forfeited estates to those nobles who had sided with the English king.
[Sidenote: Fall of Mortimer] But the pride of England had been too much roused by the struggle with the Scots to bear this defeat easily, and the first result of the treaty of Northampton was the overthrow of the government which concluded it.

This result was hastened by the pride of Roger Mortimer, who was now created Earl of March, and who had made himself supreme through his influence over Isabella and his exclusion of the rest of the nobles from all practical share in the administration of the realm.

The first efforts to shake Roger's power were unsuccessful.

The Earl of Lancaster stood, like his brother, at the head of the baronage; the parliamentary settlement at Edward's accession had placed him first in the royal Council; and it was to him that the task of defying Mortimer naturally fell.