Columbia subject headings:
Alfonso X, King of Castile and Leon, 1221-1284--Congresses.
Castile (Spain)--History--Alfonso X, 1252-1284--Congresses.
Castile (Spain)--Kings and rulers--Biography--Congresses.
Harvard subject headings:
Alfonso X, King of Castile and Leon, 1221-1284--Congresses.
Castile (Spain)--History--Alfonso X, 1252-1284--Congresses.
Castile (Spain)--Kings and rulers--Biography--Congresses.
Princeton subject headings:
Alfonso X, King of Castile and Leon, 1221-1284--Congresses.
Castile (Spain)--History--Alfonso X, 1252-1284--Congresses.
Spain--Intellectual life--711-1516--Congresses.