Columbia subject headings:
Church history--Primitive and early church, ca. 30-600.
Harvard subject headings:
Church history--Primitive and early church, ca. 30-600
Church history--Primitive and early church, ca. 30-600.
Codex (Corpus juris civilis)
Codex Theodosianus.
Princeton subject headings:
Church history--4th century.
Church history--Primitive and early church, ca. 30-600.