Columbia subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Church and state--Catholic Church.
Church and state--Holy Roman Empire.
Ecclesiastical law.
Holy Roman Empire--Foreign relations--Catholic Church.
Harvard subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Church and state--Catholic Church
Church and state--Holy Roman Empire
Ecclesiastical law.
Holy Roman Empire--Foreign relations--Catholic Church.
Princeton subject headings: