Columbia subject headings:
Church and state--History.
Church history--Middle Ages, 600-1500--Sources.
Church history--Primitive and early church, ca. 30-600--Sources.
Harvard subject headings:
Church and state--History
Church history--Middle Ages, 600-1500--Sources.
Church history--Primitive and early church, ca. 30-600--Sources.
Princeton subject headings:
Church and state--History.
Church history--Middle Ages--Sources.
Church history--Primitive and early church, ca. 30-600--Sources.