Columbia subject headings:
Philip IV, King of Spain, 1605-1665.
Spain--Politics and government--1621-1665.
Harvard subject headings:
Philip IV, King of Spain, 1605-1665.
Spain--Politics and government--1621-1665.
Princeton subject headings:
Philip IV, King of Spain, 1605-1665.
Spain--Politics and government--1621-1665.