Who was Johann Ernst, Count von Thun?

Johann Ernst, Count von Thun, was the archbishop of Salzburg. As a patron of the arts, he commissioned the renowned Austrian architect Johann Bernhard Fischer von Erlach to undertake significant projects in church architecture and town planning that fundamentally transformed the appearance of Salzburg.1

Under the archbishop's patronage, Fischer von Erlach designed several notable structures, including the Dreifaltigkeitskirche (Church of the Holy Trinity) and the Kollegienkirche (University Church). Additionally, the architect designed a new facade for the archbishop's stables, created a summer riding school from an old quarry, and built the archbishop's summer residence, Schloss Klesheim.1