Columbia subject headings:
Church history--Primitive and early church, ca. 30-600.
Papacy--History--To 1309.
Harvard subject headings:
Church history--Primitive and early church, ca. 30-600
Papacy--History--To 1309
Princeton subject headings:
Church history--Primitive and early church, ca. 30-600.
Papacy--History--To 1309.