In 1595, the former 11th-century bishop's palace was replaced by this fastuous building, on the initiative of Wolf Dietrich von Raitenau. The north-west wing only dates from the end of the 18th century. Young Mozart played numerous concerts in the Conference Hall, in front of Prince-Archbishop Colloredo's court. An antechamber overlooks the interior of the Franciscan church. Emperor Franz Joseph received Napoleon III here, then Wilhelm I.