Columbia subject headings:
Orders of knighthood and chivalry--Spain--History--Congresses.
Orders of knighthood and chivalry--Western Mediterranean--History--Congresses.
Harvard subject headings:
Orders of knighthood and chivalry--Spain--History--Congresses.
Orders of knighthood and chivalry--Western Mediterranean--History--Congresses.
Princeton subject headings:
Military religious orders--Europe--Congresses.