Columbia subject headings:
Harvard subject headings:
Italy--History--Germanic rule, 961-1268.
Robert Guiscard, Duke of Apulia, Calabria, and Sicily, approximately 1015-1085.
Victor III, Pope, 1027-1087.
Princeton subject headings:
Italy--History--Germanic rule, 961-1268.
Robert Guiscard, Duke of Apulia, Calabria, and Sicily, approximately 1015-1085.
Victor III, Pope, 1027-1087.