Columbia subject headings:
Knights and knighthood--Europe.
Knights and knighthood--Spain.
Middle Ages.
Orders of knighthood and chivalry--Europe.
Orders of knighthood and chivalry--Spain.
Harvard subject headings:
Castile (Spain)--History, Military.
Knights and knighthood--Spain--Castile--History.
Princeton subject headings:
Castile (Spain)--History, Military.
Knights and knighthood--Spain--Castile--History.