 Having been brought up in the court of his mentor and uncle, Henry I, as very much a Norman prince, he supported the claims of Matilda over those of her cousin, Stephen of Blois.Professor Barrow asserts that, even at the beginning of his reign, David was thinking of the lands of Carlisle and Cumberland, believing, as he did, that "Cumbria" (that is, the previous entity of Strathclyde/Cumbria, covered by the diocese of Glasgow) was under the overlordship of the King of Scots, and stretched as far as Westmorland and possibly down to north Lancashire or even to the River Ribble.The (first) Treaty of Durham (1136) ceded Carlisle and Cumberland to David.