Columbia subject headings:
Church and state--Germany--History.
Constitutional history--Germany.
Europe--Church history--600-1500.
Germany--History--843-1273.
Investiture.
Harvard subject headings:
Church and state--Europe--History
Europe--Church history--600-1500.
Investiture.
Monasticism and religious orders--Europe--History.
Princeton subject headings:
Church and state--Germany--History.
Constitutional history--Germany.
Europe--Church history--600-1500.
Germany--History--843-1273.
Investiture.