Columbia subject headings:
Christian pilgrims and pilgrimages--History--Congresses.
Pilgrims and pilgrimages--History--Congresses.
Harvard subject headings:
Christian pilgrims and pilgrimages--History--Congresses.
Pilgrims and pilgrimages--History--Congresses.
Princeton subject headings:
Christian civilization--Congresses.
Christian pilgrims and pilgrimages--Europe--Congresses.
Middle Ages--History--Congresses.
Social history--Medieval, 500-1500--Congresses.