Columbia subject headings:
Harvard subject headings:
Castile (Spain)--History.
Leon (Kingdom)--History.
Monarchy--Spain--Castile--History.
Monarchy--Spain--History--To 1500.
Monarchy--Spain--Leon (Kingdom)--History.
Spain--Politics and government--To 1479.
Princeton subject headings:
Castile (Kingdom). Cortes--History.
Castilla y León (Spain)--Kings and rulers--History.
Castilla y León (Spain). Cortes--History.
Social conflict--Spain--Castilla y León--History.