Already before the close of this business the disobedience of Robert of Mowbray had revealed to the king the plot against him, and a considerable part of the summer of 1095 was occupied in the reduction of the strongholds of the Earl of Northumberland. In October the king invaded Wales in person, but found it impossible to reach the enemy, and retired before the coming on of winter. In this year died the aged Wulfstan, Bishop of Worcester, the last of the English bishops who survived the Conquest. His bishopric fell into the hands of Flambard, and furnishes us one of the best examples we have of his treatment of these fiefs. On the first day of the next year died also William of St. Calais, Bishop of Durham, who had once more fallen under the king's displeasure for some reason, and who had been compelled to come up to the Christmas court, though too ill to travel. He left incomplete his new cathedral of Durham, which he had begun on a splendid scale soon after his return from exile early in the reign, beginning also a new period in Norman architecture of lighter and better-proportioned forms, with no sacrifice of the impression of solid strength. This year of 1096, which thus began for England with the death of one of the ablest of her prelates, is the date of the beginning for Europe as a whole of one of the most profound movements of medieval times. The crusades had long been in preparation, but it was the resolution and eloquence of Pope Urban which turned into a definite channel the strong ascetic feeling and rapidly growing chivalric passion of the west, and opened this great era. The Council of Clermont, at which had occurred Urban's famous appeal and the enthusiastic vow of the crusaders, had been held in November, 1095, and the impulse had spread rapidly to all parts of France. The English nation had no share in this first crusade, and but little in the movement as a whole; but its history was from the beginning greatly influenced by it. Robert of Normandy was a man of exactly the type to be swept away by such a wave of enthusiasm, and not to feel the strength of the motives which should have kept him at home. His duty as sovereign of Normandy, to recover the castles held by his brother, and to protect his subjects from internal war, were to him as nothing when compared with his duty to protect pious pilgrims to the tomb of Christ, and to deliver the Holy Land from the rule of the infidel. William Rufus, on the other hand, was a man to whom the motives of the crusader would never appeal, but who stood ready to turn to his own advantage every opportunity which the folly of his brother might offer. Robert's most pressing need in such an undertaking was for money, and so much more important did this enterprise seem to him than his own proper business that he stood ready to deliver the duchy into the hands of his brother, with whom he was even then in form at war for its possession, if he could