Columbia subject headings:
Harvard subject headings:
Castile (Spain)--History--Ferdinand III, 1217-1252.
Crusades
Fernando III, King of Castile and Leon, 1199?-1252.
Muslims--Spain--History
Princeton subject headings:
Castile (Spain)--History--Ferdinand III, 1217-1252.
Crusades.
Fernando III, King of Castile and Leon, 1199?-1252.
Muslims--Spain--History.