Columbia subject headings:
Alfonso X, King of Castile and Leon, 1221-1284.
Castile (Spain)--History--Alfonso X, 1252-1284.
Castile (Spain)--Kings and rulers--Biography.
Harvard subject headings:
Alfonso X, King of Castile and Leon, 1221-1284.
Castile (Spain)--History--Alfonso X, 1252-1284.
Castile (Spain)--Kings and rulers--Biography.
Princeton subject headings:
Alfonso X, King of Castile and Leon, 1221-1284.
Castile (Spain)--History--Alfonso X, 1252-1284.
Castile (Spain)--Kings--Biography.