Columbia subject headings:
Church and state--Europe--History.
Church history--Middle Ages, 600-1500.
Church--Catholicity.
Religion and culture--Europe.
Harvard subject headings:
Church and state--Europe--History
Church history--Middle Ages, 600-1500
Church--Catholicity
Religion and culture--Europe.
Princeton subject headings:
Church and state--Europe.
Church history--Middle Ages, 600-1500.
Religion and culture--Europe.
Theology, Doctrinal--History--Middle Ages, 600-1500.