Columbia subject headings:
Holy Roman Empire--Foreign relations--Catholic Church.
Otto III, Holy Roman Emperor, 980-1002.
Harvard subject headings:
Germany--Politics and government--843-1273.
Holy Roman Empire--History--843-1273.
Holy Roman Empire--Kings and rulers--Biography.
Italy--History--Germanic rule, 962-1268.
Otto III, Holy Roman Emperor, 980-1002.
Princeton subject headings:
Germany--Politics and government--843-1273.
Holy Roman Empire--History--843-1273.
Holy Roman Empire--Kings and rulers--Biography.
Italy--History--Germanic rule, 962-1268.
Otto III, Holy Roman Emperor, 980-1002.