Columbia subject headings:
Harvard subject headings:
Queens--Political aspects--Portugal--History--Congresses.
Queens--Political aspects--Spain--History--Congresses.
Queens--Portugal--History--Congresses.
Queens--Spain--History--Congresses.
Royal houses--Portugal--History--Congresses.
Royal houses--Spain--History--Congresses.
Princeton subject headings:
Nobility--Portugal--History--Congresses.
Nobility--Spain--History--Congresses.
Portugal--Politics and government--1580---Congresses.
Spain--Politics and government--1516-1700--Congresses.
Women--Portugal--History--Congresses.
Women--Spain--History--Congresses.