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