Columbia subject headings:
Byzantine Empire--History.
Church history--Primitive and early church, ca. 30-600.
History, Ancient.
World history--Early works to 1800.
Harvard subject headings:
Byzantine Empire--Politics and government--To 527
Rome--Politics and government--30 B.C.-476 A.D.
World history--Early works to 1800
Princeton subject headings:
Byzantine Empire--History.
Church history--Primitive and early church, ca. 30-600.
History, Ancient.
World history--Early works to 1800.