Question: Burkhard von Weisbriach was an ecclesiastical principality whose capital was the former city of what?
Context: Prince-Bishopric of Montenegro (Serbian: Митрополство Црногорско / "Mitropolstvo Crnogorsko" ) was an ecclesiastical principality that existed from 1696 until 1852.  It emerged from the Serbian Orthodox bishops of Cetinje, later metropolitans, who renounced Ottoman overlordship and transformed the parish of Cetinje to a Russian "de facto" protectorate, ruling as Metropolitans ("vladika", also rendered "Prince-Bishop").  The history starts with Danilo Šćepčević, a bishop of Cetinje who united several clans of Montenegro into fighting the Ottoman Empire that had occupied most of southeastern Europe.  Danilo was the first of the House of Petrović-Njegoš to occupy the office as "Metropolitan of Cetinje" until 1851, when Montenegro became a secular state (principality) under Danilo I Petrović-Njegoš.  Also, it became a brief monarchy when it was temporary abolished 1767–1773, when impostor Little Stephen, posed as Russian Emperor and crowned himself Lord of Montenegro. Burkhard von Weisbriach (died 1466) was a German Roman Catholic cardinal and Prince-Archbishop of Salzburg from 1461 until his death. The Electorate of Trier (German: "Kurfürstentum Trier" or "Kurtrier "), traditionally known in English by its French name of Trèves, was an ecclesiastical principality of the Holy Roman Empire that existed from the end of the 9th to the early 19th century.  It consisted of the temporal possessions of the prince-archbishop of Trier ("Erzbistum Trier "), also prince-elector of the empire.  There were only two other ecclesiastical prince-electors in the Empire: the Electorate of Cologne and the Electorate of Mainz, among which Mainz ranked first. The Basel City Walls are a former complex of walls in the central part of the Swiss city of Basel.  The first city wall was completed around 1080 under bishop Burkhard von Fenis.  A newer wall was constructed around 1230, which is known as the "Inner Wall".  In 1362 the construction of a larger wall complex began due to the city's expansion; it was completed in 1398, and is known as the "Outer Wall".  In 1859 the city's executive decided to raze wall and gates to the ground.  Three city gates and a short piece of the wall were saved from demolition and are being preserved as part of the city's heritage. The Bishopric of Münster was an ecclesiastical principality in the Holy Roman Empire, located in the northern part of today's North Rhine-Westphalia and western Lower Saxony.  From the sixteenth to the eighteenth centuries, it was often held in personal union with one or more of the nearby ecclesiastical principalities of Cologne, Paderborn, Osnabrück, Hildesheim, and Liège. Salm was a Lotharingian noble family originating from Salmchâteau in the Ardennes (present-day Belgium) and ruling Salm.  The dynasty is above all known for the experiences of the Upper Salm branch which came to be located at Château de Salm in the Vosges mountain range and over time came to rule over a principality whose capital was Badonviller then Senones. The Electorate of Cologne (German: "Kurfürstentum Köln" ), sometimes referred to as Electoral Cologne (German: "Kurköln" ), was an ecclesiastical principality of the Holy Roman Empire that existed from the 10th to the early 19th century.  It consisted of the Hochstift — the temporal possessions — of the Archbishop of Cologne and ruled by him in his capacity as prince-elector.  The Electorate should not be confused with the Roman Catholic Archdiocese of Cologne, which was larger and over which the Elector-Archbishop exercised only spiritual authority.  There were only two other ecclesiastical prince-electors in the Empire: the Electorate of Mainz and the Electorate of Trier.  The Archbishop-Elector of Cologne was also Arch-chancellor of Italy (one of the three component titular kingdoms of the Holy Roman Empire, the other two being Germany and Burgundy) and, as such, ranked second among all ecclesiastical and secular princes of the Empire, after the Archbishop-Elector of Mainz, and before that of Trier. 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 ". The Principality of Stavelot-Malmedy was an ecclesiastical principality of the Holy Roman Empire.  Princely power was exercised by the Benedictine abbot of the imperial double monastery of Stavelot and Malmedy, founded in 651.  At 600 km2 , it was among the smaller territories in the Empire.  Along with the Duchy of Bouillon and the Prince-Bishopric of Liège, it was one of only three principalities of the Southern Netherlands that were never part of the Spanish (later, Austrian) Netherlands, all having been a part of the Lower Rhenish Imperial Circle, rather than the Burgundian Circle. Burkhard von Dallwitz (born 1959) is a German-born composer based in Melbourne, Australia.  He was born near Frankfurt and began ten years of classical piano training at the age of eight.  By thirteen he was writing songs and music, and from fifteen, Burkhard wrote, arranged and performed for various musical groups.
Answer: Iuvavum