 Logically, the Norman rulers (first counts of Rouen and then dukes of Normandy) tried to bring about the political unification of the two different Viking settlements of pays de Caux-lower Seine in the east and Cotentin in the west.Furthermore, Rollo re-established the archbishopric of Rouen and wanted to restore the traditional limits of his archbishopric in the west, that had always included Cotentin and Avranchin.While Viking raiders pillaged, burned, or destroyed many buildings, it is likely that ecclesiastical sources give an unfairly negative picture