Trierer Dom
Cardinal Hesler wished to become a prince-bishop. His patron, Friedrich III, convinced Sixtus IV to issue a papal bull dated 1 July 1478 forbidding the cathedral chapters of St. Martin's Cathedral, Utrecht, Liège Cathedral, Cambrai Cathedral, the Cathedral of Trier, Cologne Cathedral, Mainz Cathedral, Würzburg Cathedral, Bamberg Cathedral, Eichstätt Cathedral, Speyer Cathedral, Salzburg Cathedral, St. Stephan's Cathedral, Passau, Augsburg Cathedral, Freising Cathedral, Münster Cathedral, Regensburg Cathedral, and Besançon Cathedral from electing a bishop without the prior permission of the pope and the emperor. In Speyer, Strassburg, and Passau, the chapters simply ignored this prohibition.