the so-called Sea-kings of Denmark and Norway in the ninth and tenth centuries. These, as the empire of Charlemagne declined, insulted and dismembered it. They converted Neustria in Normandy=the country of the Northmen. The exact amount of their influence has not been ascertained; nor is[32] the investigation easy. The process, however, by which we measured the original extent of the Frisian area is applicable to that of the Northmen. There are Norse names for French localities. Of these the most important are the compounds of -tot, -fleur, and -bec; like Yve-tot, Har-fleur, and Caude-bec.