The first treaty of Durham was a peace treaty concluded between kings Stephen of England and David I of Scotland on 5 February 1136. In January 1136, during the first months of the reign of Stephen, David I crossed the border and reached Durham. He took Carlisle, Wark, Alnwick, Norham and Newcastle-upon-Tyne. On 5 February 1136, Stephen reached Durham with an imposing troop of Flemish mercenaries, and the Scottish king was obliged to negotiate. Stephen recovered Wark, Alnwick, Norham and Newcastle, and let David I retain Carlisle and a great part of Cumberland and Lancashire, alongside Doncaster.