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