城郭（城塞） 平城 モット・アンド・ベイリー 11世紀 Robert de Cardinham, lord of the manor 1192?1225, then built up the inner curtain walls and converted the gatehouse completely to stone, giving the castle its current design. The village of Lostwithiel was established close to the castle at around the same time. The castle belonged to the Cardinhams for several years, who used it in preference to their older castle at Old Cardinham. Andrew de Cardinham's daughter, Isolda de Cardinham, finally married Thomas de Tracey, who then owned the castle until 1264. The castle was seized in 1264 without fighting by Simon de Montfort during the civil conflicts in the reign of Henry III, and was seized back in turn by the former High Sheriff of Cornwall, Sir Ralph Arundell, in 1265. After some persuasion, Isolda de Cardinham granted the castle to Henry III's brother, Richard of Cornwall in 1270. Richard died in 1271, and his son Edmund took over Restormel as his main administrative base, building the inner chambers to the castle during his residence there and titling it his "duchy palace". The castle in this period resembled a "miniature palace", with luxurious quarters and piped water. It was home to stannary administration and oversaw the local, profitable tin-mines in the village.
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