At the end of June the great council of the kingdom came together at Oxford, and there it was that Stephen committed the fatal mistake which turned the tide of affairs against him. Of all the men who had been raised to power in the service of Henry I, none occupied so commanding a position as Roger, Bishop of Salisbury. As a priest he had attracted the attention of Henry before he became king by the quickness with which he got through the morning mass; he was taken into his service, and steadily rose higher and higher until he became the head of the whole administrative system, standing next to the king when he was in England, and exercising the royal authority, as justiciar, when he was absent. In his rise he had carried his family with him. His nephew Alexander was Bishop of Lincoln. Another nephew Nigel was Bishop of Ely. His son Roger was chancellor of the kingdom. The administrative and financial system was still in the hands of the family. The opportunities which they had enjoyed for so many years to enrich themselves from the public revenues, very likely as a tacitly recognized part of the payment of their services, they had not neglected. But they had gone further than this. Evidently with some ulterior object in view, but with precisely what we can only guess, they had been strengthening royal castles in their hands, and even building new ones. That bishops should fortify castles of their own, like barons, was not in accordance with the theory of the Church, nor was it in accordance with the custom in England and Normandy. The example had been followed apparently by Henry of Winchester, who had under his control half a dozen strongholds. The situation would in itself, and in any circumstances, be a dangerous one. In the present circumstances the suspicion would be natural that a family which owed so much to King Henry was secretly preparing to aid his daughter in an attempt to gain the throne, and this suspicion was generally held by the king's party. To this may be added the fact that, in the blow which he now struck, we very possibly have an attempt on Stephen's part to carry further the policy of weakening, in the interest of the crown, the too strong ecclesiastical and baronial element in the state, which he had begun in refusing the archbishopric of Canterbury to his brother. The wealth of the family may have been an additional incentive, and intrigues against these bishops by the powerful house of Beaumont are mentioned. There is no reason to suppose, however, that the Beaumonts were not acting, as they had so often done, in the real interests of the king, which plainly demanded the breaking up of this threatening power. There was nothing to indicate that the present was not a favourable time to undertake it, and the best accounts of these events give us the impression that Stephen was acting throughout with much confidence and a feeling of strength and security.