Columbia subject headings:
Aragon (Spain)--History--Fernando I, 1412-1416.
Fernando I, King of Aragon, 1379-1416.
Feudalism.
Nobility--Spain--Aragon--Economic conditions.
Harvard subject headings:
Aragon (Spain)--History--Fernando I, 1412-1416.
Fernando I, King of Aragon, 1379-1416.
Feudalism
Nobility--Spain--Aragon--Economic conditions.
Princeton subject headings: