Columbia subject headings:
Councils and synods--Holy Roman Empire--History.
Councils and synods--Italy--History.
Holy Roman Empire--Church history.
Italy--Church history.
Harvard subject headings:
Church history--Middle Ages, 600-1500
Councils and synods--Germany.
Councils and synods--Holy Roman Empire--History.
Councils and synods--Italy.
Germany--Church history--843-1517.
Holy Roman Empire--Church history.
Italy--Church history--476-1400.
Princeton subject headings:
Councils and synods--Holy Roman Empire--History.
Councils and synods--Italy--History.
Holy Roman Empire--Church history.
Italy--Church history.