Columbia subject headings:
Folz, Robert.
Middle Ages.
Monarchy--Europe--History--To 1500.
Harvard subject headings:
Civilization, Medieval--Congresses
Europe, Central--Antiquities--Congresses.
Folz, Robert--Congresses.
Folz, Robert.
Middle Ages.
Monarchy--Europe--History--To 1500.
Princeton subject headings:
Folz, Robert.
Middle Ages.
Monarchy--Europe--History--To 1500.