Columbia subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Gregory XV, Pope, 1554-1623.
Holy Roman Empire--Foreign relations--Catholic Church.
Maximilian I, Elector of Bavaria, 1573-1651.
Harvard subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Gregory XV, Pope, 1554-1623.
Holy Roman Empire--Foreign relations--Catholic Church.
Maximilian I, Elector of Bavaria, 1573-1651.
Princeton subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Gregory XV, Pope, 1554-1623.
Holy Roman Empire--Foreign relations--Catholic Church.
Maximilian I, Elector of Bavaria, 1573-1651.