Overlapping authorities, vikings in Frisia and the church of Utrecht.

This article focuses on the political context behind the 858 relocation of the Utrecht clergy to the abbey of Sint Odiliënberg, granted by King Lothar II as a refuge from Viking attacks. It argues that this move was not simply a reaction to Viking violence but resulted from complex pressures arising from overlapping authorities in ninth-century Frisia, a region influenced simultaneously by Carolingian and Danish powers. The article highlights how Danish elites, such as Roric of Dorestad, operated within both Danish and Carolingian political spheres, and how Viking raids in Frisia were often strategic actions tied to internal Danish civil wars rather than random piracy. Ultimately, it emphasizes the importance of understanding early medieval politics as shaped by intersecting and overlapping jurisdictions rather than clear-cut territorial boundaries.