Frederick III, Holy Roman Emperor
Inside the cathedral are the tombs of Prince Eugene of Savoy (PES), commander of the Imperial forces during the War of the Spanish Succession in the "Chapel of The Cross" (northwest corner of the cathedral) and of Frederick III, Holy Roman Emperor (Fr3), under whose reign the Diocese of Vienna was canonically erected on 18 January 1469, in the Apostles' Choir (southeast corner of the cathedral).