Columbia subject headings:
Harvard subject headings:
Rome (Italy)--Foreign relations--17th century.
Rome (Italy)--Foreign relations--Spain.
Rome (Italy)--Relations--Spain.
Spain--Foreign relations--1598-1621.
Spain--Foreign relations--Italy--Rome.
Spain--Relations--Italy--Rome.
Princeton subject headings:
Rome (Italy)--Foreign relations--17th century.
Rome (Italy)--Foreign relations--Spain.
Rome (Italy)--Relations--Spain.
Spain--Foreign relations--1598-1621.
Spain--Foreign relations--Italy--Rome.
Spain--Relations--Italy--Rome.