Columbia subject headings:
Castile (Spain)--History--Alfonso VI, 1065-1109.
Cid, approximately 1043-1099.
Heroes--Spain--Biography.
Nobility--Spain--Castile--Biography.
Harvard subject headings:
Cid, approximately 1043-1099
Spain--History--711-1516.
Princeton subject headings:
Cid, approximately 1043-1099.
Spain--History--711-1516.