At the beginning of the reign of Charles the Bald, the integrity of Anjou was seriously menaced by a twofold danger: from Brittany to the west and from Normandy to the north. Lambert, a former count of Nantes, devastated Anjou in concert with Nominoé, duke of Brittany. By the end of the year 851, he had succeeded in occupying all the western part as far as the Mayenne. The principality which he thus carved out for himself was occupied on his death by Erispoé, duke of Brittany. By him, it was handed down to his successors, in whose hands it remained until the beginning of the 10th century. The Normans raided the country continuously as well.