England and Scotland sign the Treaty of York, establishing the location of their common border.

The Treaty of York, signed in 1237, was a significant agreement between England and Scotland that established the Anglo-Scottish border. The treaty was negotiated between King Henry III of England and King Alexander II of Scotland, and it marked a resolution of territorial disputes between the two kingdoms, particularly regarding lands in the northern regions of England.

Key points about the Treaty of York include:

Border Definition: The treaty defined the boundaries between England and Scotland, which, for the most part, remain in place to this day. It solidified English control over certain territories south of the border, such as Northumberland and Cumberland, while Scotland recognized those areas as part of England.

Peaceful Relations: The treaty sought to establish peaceful relations between the two kingdoms by resolving territorial tensions and clarifying ownership of disputed lands, reducing the likelihood of conflict in the region.

Scottish Holdings in England: Although the treaty did not grant Alexander II any additional territories in England, it confirmed certain privileges for Scottish lords who held lands within England.