Burkhard von Weisbriach was an ecclesiastical principality whose capital was the former city of what?
Archbishopric of Salzburg The Prince-Archbishopric of Salzburg (German: "Fürsterzbistum Salzburg" ) was an ecclesiastical principality and state of the Holy Roman Empire. It comprised the secular territory ruled by the Archbishops of Salzburg, as distinguished from the much larger Catholic diocese founded in 739 by Saint Boniface in the German stem duchy of Bavaria. The capital of the archbishopric was Salzburg, the former Roman city of "Iuvavum ".
Archbishopric of Bremen The Archdiocese of Bremen (also "Archdiocese of Hamburg-Bremen", German: "Erzbistum Bremen" , not to be confused with the modern Archdiocese of Hamburg, founded in 1994) is a historical Roman Catholic diocese (787–1566/1648) and formed from 1180 to 1648 an ecclesiastical state (continued under other names until 1823), named Prince-Archbishopric of Bremen (German: "Erzstift Bremen" ) within the Holy Roman Empire. The prince-archbishopric consisted of about a third of the diocesan territory. The city of Bremen was "de facto" (since 1186) and "de jure" (since 1646) not part of the prince-archbishopric but belonged to the archdiocese. Most of the prince-archbishopric lay rather in the area to the north of the "city of Bremen", between the Weser and Elbe rivers. Even more confusingly, parts of the prince-archbishopric belonged in religious respect to the neighbouring "diocese of Verden", making up 10% of its diocesan territory.