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 ".
Kaiserpfalz The term Kaiserpfalz (] , "imperial palace") or Königspfalz (] , "royal palace", from Middle High German "phal[en]ze" to Old High German "phalanza" from Middle Latin "palatia" [plural] to Latin "palatium" "palace") refers to a number of castles and palaces across the Holy Roman Empire that served as temporary, secondary seats of power for the Holy Roman Emperor in the Early and High Middle Ages. The term was also used more rarely for a bishop who, as a territorial lord ("Landesherr"), had to provide the king and his entourage with board and lodging, a duty referred to as "Gastungspflicht".