In 1215, with the approval of Pope Innocent III, the Salzburg archbishop Eberhard von Regensburg made the monastery church the cathedral of a suffragan diocese in its own right, the Bishopric of Chiemsee, including several parishes on the mainland and in Tyrol. The Augustinian convent acted as cathedral chapter, while the auxiliary bishops retained their seat at the "Chiemseehof" palace in Salzburg. The Herrenchiemsee chapter was headed by provosts who from 1218 also held the position of an archdeacon. They even obtained pontifical vestments and the right of papal count palatines in the 15th century.