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