Henry and Alexander had a history of making agreements to settle one matter or another, and related to this was their personal relationship. Alexander was married to Henry's sister Joan and Alexander's sister Margaret had married Hubert de Burgh, a former regent to Henry. On 13 August 1237 Henry advised Otho that he would meet Alexander at York to treat of peace. An agreement was reached on 25 September "respecting all claims, or competent to, the latter, up to Friday next before Michaelmas A.D. 1237".