Columbia subject headings:
Queens--Portugal--History.
Queens--Spain--History.
Women--Political activity--Portugal--History.
Women--Political activity--Spain--History.
Harvard subject headings:
Portugal--Politics and government--To 1580--Congresses.
Princesses--Portugal--History--Congresses.
Princesses--Spain--History--Congresses.
Queens--Political activity--Portugal--History--Congresses.
Queens--Political activity--Spain--History--Congresses.
Queens--Portugal--History--Congresses.
Queens--Spain--History--Congresses.
Spain--Politics and government--To 1479--Congresses.
Princeton subject headings:
Portugal--Politics and government--To 1580--Congresses.
Princesses--Portugal--History--Congresses.
Princesses--Spain--History--Congresses.
Queens--Political activity--Portugal--History--Congresses.
Queens--Political activity--Spain--History--Congresses.
Queens--Portugal--History--Congresses.
Queens--Spain--History--Congresses.
Spain--Politics and government--To 1479--Congresses.