Columbia subject headings:
Harvard subject headings:
Alfonso X, King of Castile and Leon, 1221-1284--Criticism and interpretation--Congresses.
Spain--History--711-1516--Congresses.
Princeton subject headings:
Alfonso X, King of Castile and Leon, 1221-1284--Congresses.
Spain--Civilization--711-1516--Congresses.
Spain--History--711-1516--Congresses.