Claim: In 1264, the Mitford Castle was held by the third Roger Bertram, then in 1275, it was held by Alexander de Balliol.
Evidence: In 1264, the castle was held by the third Roger Bertram, but in that year, it was seized from him and committed to the custody of William de Valence, 1st Earl of Pembroke, King Henry's half-brother. It was held by Alexander de Balliol, the son of John de Balliol and the elder brother of King John, in 1275.