Columbia subject headings:
Kristín Hákonardóttir, 1234-1262.
Princesses--Norway--Biography.
Princesses--Spain--Leon (Kingdom)--Biography.
Harvard subject headings:
Christina, Princess of Norway, 1234-1262.
Norway--History--Haakon Gamli, 1217-1263.
Princesses--Norway--Biography.
Princesses--Spain--Biography
Queens--Spain--Biography
Spain--History.
Princeton subject headings:
Kristín Hákonardóttir, 1234-1262.
Princesses--Norway--Biography.
Princesses--Spain--Leon (Kingdom)--Biography.