Columbia subject headings:
Aragon (Spain)--History--Peter III, 1276-1285.
Aragon (Spain)--Kings and rulers--Biography.
Pedro III, King of Aragon, 1240-1285.
Harvard subject headings:
Aragon (Spain)--History--Peter III, 1276-1285.
Aragon (Spain)--Kings and rulers--Biography.
Pedro III, King of Aragon, 1239-1285.
Princeton subject headings: