After the court adjourned, St-Calais was held as a prisoner at Wilton Abbey until his followers in Durham relinquished the castle. Once the castle was back under the king's control, St-Calais was released, and exiled; he left for Normandy, and no more was heard of his appeal to Rome. Pope Urban II did write to the king in 1089 requesting that St-Calais be restored to his see, but nothing came of it. In Normandy, St-Calais quickly became one of Duke Robert's principal advisors and his chief administrator. On 14 November 1091 he regained the favour of William Rufus, and was restored to his see. Duke Robert had persuaded the king to allow Bishop William's return, perhaps in recognition of a service St-Calais performed for the king by brokering the end of a siege in Normandy that the king's forces were about to lose. The end of the siege prevented the loss of the castle.