Columbia subject headings:
Communities--Europe.
Communities--Religious aspects--Christianity--History.
Europe--Church history--600-1500.
Priesthood--History of doctrines.
Priests--History.
Harvard subject headings:
Communities--Europe--History--To 1500--Congresses.
Communities--Religious aspects--Christianity--History--Congresses.
Europe--Church history--600-1500--Congresses.
Identification (Religion)--History--Congresses.
Priesthood--History--To 1500--Congresses.
Priests--Europe--History--Congresses.
Princeton subject headings:
Communities--Europe.
Communities--Religious aspects--Christianity--History.
Europe--Church history--600-1500.
Priesthood--History.
Priests--History.