Columbia subject headings:
Aragon (Spain)--History.
Pedro III, King of Aragon, 1240-1285.
Spain--History--Sources.
Harvard subject headings:
Aragon (Spain)--History.
Pedro III, King of Aragon, 1239-1285.
Spain--History--Sources.
Princeton subject headings:
Aragon (Spain)--History--Sancho Ramírez, 1063-1094.
Pedro III, King of Aragon, 1239-1285.
Spain--History--Sources.