Columbia subject headings:
Europe--History--476-1492.
Great Britain--Foreign relations--Portugal.
Great Britain--Foreign relations--Spain.
Portugal--Foreign relations--Great Britain.
Spain--Foreign relations--Great Britain.
Harvard subject headings:
Europe--History--476-1492.
Great Britain--Foreign relations--Portugal.
Great Britain--Foreign relations--Spain.
Portugal--Foreign relations--Great Britain.
Spain--Foreign relations--Great Britain
Princeton subject headings:
Europe--History--476-1492.
Great Britain--Foreign relations--Portugal.
Great Britain--Foreign relations--Spain.
Portugal--Foreign relations--Great Britain.
Spain--Foreign relations--Great Britain.