Analysis of information sources in references of the Wikipedia article "Καθεδρικός Ναός Αγίου Στεφάνου (Βιέννη)" in Greek language version.
(...) History of Construction: First (?) construction 1137, consecrated 1147, completed as parish church (in possession of the bishopric of Passau) in 1160 (lower floors of the eastern "Heidentürme" and lower parts of the wall divisions are still extant). The various princes subsequently tried to found an independent diocese at St. Stephen's. Vienna was finally granted the status of a diocese in 1469 and St. Stephen's became a cathedral; metropolitan church of the archdiocese since 1723. (...)
(...) History of Construction: First (?) construction 1137, consecrated 1147, completed as parish church (in possession of the bishopric of Passau) in 1160 (lower floors of the eastern "Heidentürme" and lower parts of the wall divisions are still extant). The various princes subsequently tried to found an independent diocese at St. Stephen's. Vienna was finally granted the status of a diocese in 1469 and St. Stephen's became a cathedral; metropolitan church of the archdiocese since 1723. (...)
