Columbia subject headings:
Harvard subject headings:
Castile (Spain)--History, Military.
Knights and knighthood--Spain--Castile.
Knights and knighthood--Spain--Leon (Kingdom)
Leon (Kingdom)--History, Military.
Military art and science--History
Military art and science--History--Medieval, 500-1500
Princeton subject headings:
Castile (Spain)--History, Military.
Knights and knighthood--Spain--Castile.
Knights and knighthood--Spain--Leon (Kingdom).
Leon (Kingdom)--History, Military.
Military art and science--History.