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France in the Middle Ages later years of the elderly Charlemagne's rule, the Vikings made advances along the northern and western perimeters of his kingdom. After Charlemagne's death in 814 his heirs were incapable of maintaining political unity and the empire began to crumble. The Treaty of Verdun of 843 divided the Carolingian Empire, and Charles the Bald ruled over West Francia, roughly corresponding to the territory of modern France. Viking advances were allowed to escalate, and their dreaded longboats were sailing up the Loire and Seine Rivers and other inland waterways, wreaking havoc and spreading terror. In 843 Viking invaders murdered the Bishop of