Columbia subject headings:
Ambassadors--Spain--Correspondence.
Hurtado de Mendoza, Lope, -1558--Correspondence.
Portugal--Foreign relations--Spain.
Spain--Foreign relations--1516-1556.
Spain--Foreign relations--Portugal.
Harvard subject headings:
Ambassadors--Spain--Correspondence.
Hurtado de Mendoza, Lope, -1558--Correspondence.
Portugal--Foreign relations--Spain--Sources.
Portugal--Foreign relations--Spain.
Spain--Foreign relations--1516-1556--Sources.
Spain--Foreign relations--1516-1556.
Spain--Foreign relations--Portugal--Sources.
Spain--Foreign relations--Portugal.
Princeton subject headings:
Hurtado de Mendoza, Lope, -1558--Correspondence.
Portugal--Foreign relations--Spain--Sources.
Spain--Foreign relations--1516-1556--Sources.
Spain--Foreign relations--Portugal--Sources.