Columbia subject headings:
France--Foreign relations--Germany--Trier.
France--History--Louis XIII, 1610-1643.
Trier (Germany)--Foreign relations--France.
Harvard subject headings:
France--Foreign relations--Germany--Trier.
France--History--Louis XIII, 1610-1643.
Trier (Germany)--Foreign relations--France.
Princeton subject headings:
France--Foreign relations--Treves (Electorate).
France--History--Louis XIII, 1610-1643.
Treves (Electorate)--Foreign relations--France.