 Oldenburg was then a suffragan diocese of the Archbishopric of Bremen, meant to missionize the Obotrites.However, in the course of the 983 Slavic uprising ("see Lutici"), the Wagri shook off Imperial supremacy and in 1038, the bishops were barred from entering their diocese.In 1052, the dioceses of Ratzeburg and Schwerin were split off from Oldenburg and no bishop was appointed after 1066.