the rebels at Val-ès-dunes, near Caen. William then took Brionne. He ordered Guy to remain in his court, and afterwards allowed him to go to Burgundy; the other rebel lords were punished by fines and by the destruction of the castles which they had built without license; the lord who had attempted to seize the duke was imprisoned at Rouen and died there. The duke's victory established his power throughout Normandy.
In return for Henry's help William in 1048 joined him in a war against Geoffrey Martel, count of Anjou. The duke was resolved to take his place as pre-eminent among his barons in battle, and showed so much daring that the king warned him to be less adventurous. Though, so far as the French were concerned, the campaign was short, it led to a war between William and Geoffrey, in which the duke regained Domfront and Alençon, fortresses on the border of Maine, then virtually under the rule of Geoffrey. While besieging Domfront he challenged Geoffrey to a personal combat, but the count, though he accepted the challenge, retreated without meeting him. At Alençon the inhabitants jeered at William by beating hides on their walls, and calling him ‘tanner.’ In revenge he cut off the hands and feet of thirty-two of them. At the end of the war he raised fortifications at Ambrières, in Maine itself. In 1051 William visited England, and must have found himself at home among the Normans and Frenchmen of the court of his cousin, Edward the Confessor [q. v.], who probably during his visit promised that he should succeed him. Meanwhile he was with the advice of his lords seeking to marry Matilda, daughter of the Count of Flanders, an alliance of great political importance, both on account of the count's power and the situation of his dominions. The marriage was forbidden by Leo IX at the council of Reims in 1049 [see under Matilda (d. 1083) and Lanfranc], and in consequence was not celebrated until 1053. Malger, archbishop of Rouen, the duke's uncle, threatened, and perhaps pronounced, excommunication against the duke; but William gained over Lanfranc to his side, and finally Nicolas II granted a dispensation for the marriage in 1059. In accordance with the pope's commands on this occasion William built the abbey of St. Stephen at Caen.
An unimportant revolt of the lord of Eu was followed in 1053 by the revolt of William of Arques, one of the duke's uncles and brother of Archbishop Malger. This William, who had constantly been disloyal to his nephew, was upheld by the French king, who marched to the relief of Arques when it was invested by the duke. To avoid fighting in person against his liege lord, the duke left the siege for a while to William Giffard. The French suffered in a skirmish at St. Aubin, and retired without relieving the place, which surrendered to the duke. The garrison made an abject submission, and William allowed his uncle to leave the duchy. Jealous of the almost kingly power of the duke, Henry of France formed a league against him with some of his great vassals and invaded the duchy on both sides of the Seine early in 1054. To meet this pressing danger, William also divided his force into two bodies, and himself led one of them to operate against the division commanded by the king on the left of the river, giving some of his lords the command of the force which was to oppose the army led by the king's brother Eudes and others on the right of the river. The army of Eudes was surprised and routed at Mortemer, and one of its leaders, Guy, count of Ponthieu, was taken prisoner. William, who was near the king's army when he heard of the victory of his lords, sent one of his followers to climb a tree or rock near the French camp by night and announce it to the king's army, and on hearing the news Henry hastily retreated into France.
Peace was made with France in 1055, and William, with the king's good-will, turned on the Count of Anjou. He ordered that the fortification of Ambrières should be pressed forward, and sent to tell Geoffrey that he would be there within forty days to meet him. Geoffrey of Mayenne, whose town lay near Ambrières, entreated the count's help against the Normans. The count promised that it should be given, but allowed the works to be completed. He then besieged the place in conjunction with the Count of Aquitaine and a force from Brittany. William at once prepared to go to its relief, and on hearing that he was coming Geoffrey raised the siege. Geoffrey of Mayenne, who had been taken prisoner by the Normans, renounced his fealty to the count and did homage to William. About this time also William received homage from Guy, count of Ponthieu, who, in return for his release from prison, bound himself to do the duke military service (Ord. Vit. p. 658).
William was highly displeased by the unseemly life and extravagance of Archbishop Malger, and often reproved him both publicly and in private. He was also angered by the line that his uncle had taken with reference to his marriage, and further suspected him of complicity in the revolt of his
