Columbia subject headings:
Church history--Primitive and early church, ca. 30-600.
Holy Roman Empire--History.
Rome--Religion.
Harvard subject headings:
Church history--Primitive and early church, ca. 30-600
Holy Roman Empire--History.
Rome--Religion.
Princeton subject headings:
Church history--Primitive and early church, ca. 30-600.
Holy Roman Empire--History.
Rome--Religion.