Columbia subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Church history--Primitive and early church, ca. 30-600--Congresses.
Harvard subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Church history--Primitive and early church, ca. 30-600--Congresses.
Time--Religious aspects--Christianity--Congresses.
Princeton subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Church history--Primitive and early church, ca. 30-600--Congresses.