A.D. 1091. MALCOLM INVADES NOHTBTTMBBIA. 173 In the year 1091, king William the Younger went over to Normandy in the month of February, with the design of taking it from his brother Robert ; but, while ho was there, peace was made between them by treaty, on condition that the duke should with good faith deliver up to the king the earldom of Eu,84 Feschamp, the abbey of Mount Saint Michael, and Keresburg,85 with the castles which had revolted from him, and that the king should reduce to subjection to the duke the province of Maine and the castles of Normandy, which were then making resistance to him. It was also agreed that the king should restore their lands in England to all the Normans who had lost them by reason of their fidelity to the duke, and should also give to the duke as much land in England as was then arranged between them. In addition to this, they came to an understanding that if the duke should die without a son lawfully born in wedlock, the king should be his heir ; and, in like manner, if the king should happen to die, the duke should be his heir. Twelve barons on the king's side and twelve on the duke's guaranteed this treaty by oath. In the meantime, while these matters were being treated of, their brother Henry,86 having raised all the troops he could, with the aid of some of the monks in the place, took possession of Mount Saint Michael, laid waste the king's lands, and took prisoners some of his men, and spoiled others. In consequence of this, the king and the duke, assembling an army, besieged the Mount during the whole of Lent, and had frequent skirmishes, and lost some men and horses. Rut the king, growing wearied of the protracted siege, retired without coming to terms, and, shortly after, dispossessed the Clito Edgar of all the honors whieh the duke had conferred upon him, and banished him from Normandy. In the meantime, in the month of May, Malcolm, king of the Scots, invaded Northumbria with a large army. If he could only find provisions, his object was to make further inroads and commit acts of violence upon the people of England. But God ordained it otherwise ; and, therefore, he was impeded in his designs. The king, on hearing of this, re- 81 Called " Owe " in the text. 85 Cherbourg. 86 Of course he would naturally be displeased at the little regard paid to his interests in the compact then being made.