After Charlemagne's death the wars of his grandsons left the empire defenseless, and the Northmen in consequence redoubled their attacks. They sailed far up the Seine, the Loire, and the Garonne to plunder and murder. Paris, then a small but important city, lay in the path of the invaders and more than once suffered at their hands. The destruction by the Northmen of many monasteries was a loss to civilization, for the monastic establishments at this time were the chief centers of learning and culture. [13] THE NORTHMEN IN GERMANY The heavy hand of the Northmen also descended on Germany. The rivers Scheldt, Meuse, Rhine, and Elbe enabled them to proceed at will into the heart of the country. Liège, Cologne, Strassburg, Hamburg, and other great Frankish cities fell before them. Viking raiders even plundered Aachen and stabled their horses in the church which Charlemagne had built there. [14] Thus the ancient homeland of the Franks was laid completely waste. ROLLO AND THE GRANT OF NORMANDY, 911 A.D. The history of the Northmen in France began in 911 A.D., when the Carolingian king granted to a Viking chieftain, Rollo, dominion over the region about the lower Seine. Rollo on his part agreed to accept Christianity and to acknowledge the French ruler as his lord. It is said, however, that he would not kneel and kiss the king's foot as a mark of homage, and that the follower who performed the unwelcome duty did it so awkwardly as to overturn the king, to the great amusement of the assembled Northmen. The story illustrates the Viking sense of independence. DUCHY OF NORMANDY The district ceded to Rollo developed into what in later times was known as the duchy of Normandy. Its Scandinavian settlers, henceforth called Normans, [15] soon became French in language and culture. It was amazing to see how quickly the descendants of wild sea-rovers put off their heathen ways and made their new home a Christian land, noted for its churches, monasteries, and schools. Normandy remained practically independent till the beginning of the thirteenth century, when a French king added it to his possessions. [16] THE NORMANS AND HUGH CAPET, 987 A.D. The Normans helped to found the medieval French monarchy. During the tenth century the old Carolingian line of rulers, which had already died out in Germany and Italy, [17] came also to an end in France. A new dynasty was then founded by a nobleman named Hugh Capet, who secured the aid of the powerful Norman dukes in his efforts to gain the throne. The accession of Hugh Capet took place in 987 A.D. His descendants reigned over France for almost exactly eight hundred years. [18] * * * * * 144. CONQUEST OF ENGLAND BY THE DANES; ALFRED THE GREAT ENGLAND OVERRUN BY THE DANES