Columbia subject headings:
Champagne-Ardenne (France)--History--Congresses.
Crusades--Congresses.
Harvard subject headings:
Champagne-Ardenne (France)--History--Congresses.
Crusades--Congresses
Princeton subject headings:
Champagne-Ardenne (France)--Church history--Congresses.
Champagne-Ardenne (France)--History--Congresses.
Crusades--Congresses.