Columbia subject headings:
Christianity--Iran--History.
Christianity--Middle East--History.
Church history--Primitive and early church, ca. 30-600.
Church of the East--Iran--History.
Iran--Church history--Early church, ca. 30-600.
Iran--Church history--Middle Ages, 600-1500.
Harvard subject headings:
Iran--Church history.
Iran--Religion.
Princeton subject headings: