Columbia subject headings:
Catholic Church--Foreign relations--France.
France--Foreign relations--Catholic Church.
Harvard subject headings:
Castelli, Giovanni Battista, 1517-1583--Correspondence.
Catholic Church--Foreign relations--France--Sources.
Catholic Church--Foreign relations--France.
France--Foreign relations--Catholic Church--Sources.
France--Foreign relations--Catholic Church.
Princeton subject headings:
Catholic Church--Foreign relations--France.
France--Foreign relations--Catholic Church.