Columbia subject headings:
Castile (Spain)--Administrative and political divisions--History.
Feudalism--Spain--Castile.
Monarchy--Spain--Castile.
Spain--History--711-1516.
Harvard subject headings:
Castile (Spain)--History--Ferdinand III, 1217-1252.
Castile (Spain)--Territorial expansion.
Civilization, Medieval--13th century
Feudalism--Spain
Leon (Kingdom)--Territorial expansion.
Princeton subject headings:
Castile (Spain)--History--Ferdinand III, 1217-1252.
Castile (Spain)--Territorial expansion.
Leon (Kingdom)--Territorial expansion.