Columbia subject headings:
Harvard subject headings:
Holy Roman Empire--History--Otto I, 936-973.
Italy--History--Germanic rule, 962-1268.
Italy--History--Period of the Italian Kings, 887-962.
Otto I, Holy Roman Emperor, 912-973.
Princeton subject headings:
Holy Roman Empire--History--Otto I, 936-973.
Italy--History--Germanic rule, 962-1268.
Italy--History--Period of the Italian Kings, 887-962.
Otto I, Holy Roman Emperor, 912-973.