Anglo-Scottish border English king, Edgar the Peaceful, at his council in Chester. After Kenneth had reportedly done homage, Edgar rewarded Kenneth by granting him Lothian. Despite this transaction, the control of Lothian was not finally settled and the region was taken by the Scots at the Battle of Carham in 1018 and the River Tweed became the "de facto" Anglo-Scottish border. The Solway–Tweed line was legally established in 1237 by the Treaty of York between England and Scotland. It remains the border today, with the exception of the Debatable Lands, north of Carlisle, and a small area around Berwick-upon-Tweed, which was taken
Lord Warden of the Marches Eastern March on Berwick-upon-Tweed. The offices became unnecessary after the union of the crowns of England and Scotland under King James in 1603. Lord Warden of the Marches The Lord Warden of the Marches was an office in the governments of Scotland and England. The holders were responsible for the security of the border between the two nations, and often took part in military action. They were also responsible, along with 'Conservators of the truce', for administering the special type of border law known as March law. The Marches on both sides of the border were traditionally split into West,