Columbia subject headings:
Church history--Primitive and early church, ca. 30-600.
Priests--Rome.
Rome--Religious life and customs.
Harvard subject headings:
Church history--Primitive and early church, ca. 30-600--Congresses
Priests--Rome--Congresses.
Rome--Religion--Economic aspects--Congresses.
Rome--Religious life and customs--Congresses.
Princeton subject headings: