Columbia subject headings:
Europe--Church history--600-1500--Congresses.
Europe--Relations--Ireland--Congresses.
Ireland--Church history--To 1172--Congresses.
Ireland--Relations--Europe--Congresses.
Harvard subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Europe--Church history--600-1500.--Congresses.
Europe--Relations--Ireland--Congresses.
Ireland--Church history--To 1172--Congresses.
Ireland--Relations--Europe--Congresses.
Princeton subject headings:
Christianity and culture.
Europe--Church history--600-1500.
Ireland--Church history--To 1172.