A similar arrangement of two or three castles clustered closely together may be found in several places in the south part of neighbouring Alsatian Vosges: the Dreistein at Odilienberg near Obernai, the three castles on the Schlossberg near Reinhardsmunster, the Drei Exen near Eguisheim and the castle group of Haut-Kœnigsbourg/Oedenburg.
At first his relations with the Vikings were peaceful, but eventually Utrecht was threatened by the Vikings, at which the bishop and the entire clergy of Utrecht fled to Saint-Odiliënberg, near Roermond.