Bishopric of Chiemsee

The Bishopric of Chiemsee was a Roman Catholic diocese. While based on the islands of the Chiemsee in Bavaria, Germany, most of its territory lay in the County of Tyrol, Austria. The bishopric ceased to be a residential see in 1808. and accordingly is today listed by the Catholic Church as a titular see.

The Bishopric of Chiemsee was established by the Archbishop of Salzburg, Eberhard II of Regensberg, on the islands of the Chiemsee in 1215. It followed the precedent set by his predecessor Gebhard, who had established the Bishopric of Gurk in 1072. This system of founding quite small suffragan dioceses was to be completed by the setting up of the bishoprics of Seckau in 1218 and Lavant in 1225. It was caused by the fact, that, after a large increase in size, stretching its borders from the Inn river in Bavaria to the Hungarian border, the archdiocese of Salzburg became hard to govern. Both the Holy Roman Emperor and the Pope gave their consent and support to the establishment of the bishopric in 1213.

All bishops of Chiemsee were selected by the Archbishops, for the bishops were the most important supporters of the archbishops. The bishops usually served as auxiliary bishops or fulfilled other duties for the archbishops. Locally the ruling of the bishopric rested mostly with the archdeacons who, supported by the Dukes of Bavaria, prevented the bishops from residing in the bishopric. Therefore, the Bishops never became prince-bishops of the Empire, unlike most other ecclesiarchs. Thus the bishopric should not be considered as a state of the Holy Roman Empire, but as a territory within the state of the archbishopric. Accordingly, the bishops held a seat in the archbishoprics diet.

...
Wikipedia