John, King of England
In the late 12th and early 13th centuries the border and political relationship between England and Scotland was disputed, with the kings of Scotland claiming parts of what is now northern England. John's father, Henry II, had forced William the Lion to swear fealty to him at the Treaty of Falaise in 1174. This had been rescinded by Richard I in exchange for financial compensation in 1189, but the relationship remained uneasy. John began his reign by reasserting his sovereignty over the disputed northern counties. He refused William's request for the earldom of Northumbria, but did not intervene in Scotland itself and focused on his continental problems. The two kings maintained a friendly relationship, meeting in 1206 and 1207, until it was rumoured in 1209 that William was intending to ally himself with Philip II of France. John invaded Scotland and forced William to sign the Treaty of Norham, which gave John control of William's daughters and required a payment of 10,000. This effectively crippled William's power north of the border, and by 1212 John had to intervene militarily to support the Scottish king against his internal rivals.[nb 16] John made no efforts to reinvigorate the Treaty of Falaise, though, and both William and Alexander remained independent kings, supported by, but not owing fealty to, John.

Q: What did John force William to sign?
Treaty of Norham