Columbia subject headings:
Isabella I, Queen of Spain, 1451-1504.
Spain--History--Ferdinand and Isabella, 1479-1516.
Harvard subject headings:
Isabella I, Queen of Spain, 1451-1504.
Queens--Spain--Biography
Spain--History--Ferdinand and Isabella, 1479-1516.
Princeton subject headings:
Isabella I, Queen of Spain, 1451-1504.
Spain--History--Ferdinand and Isabella, 1479-1516.