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In the main text it says: "Diplomacy further strengthened the reconciliation by the marriage of Alexander to Henry's sister Joan of England on June 18 or June 25, 1221."
Then in the section titled Consorts it says: "She and Alexander II married on June 21, 1221"
My reading of the Treaty of York is that it did NOT define, or redefine, the Scots English boundary as stated. Though I rather suspect that some subsequent and unscrupulous Scottish king claimed it had.