Columbia subject headings:
Harvard subject headings:
Cities and towns, Medieval--Italy--Marche--Congresses.
Marche (Italy)--Church history--Congresses.
Marche (Italy)--History--Congresses.
Marche (Italy)--Social conditions--Congresses.
Social history--Medieval, 500-1500--Congresses
Princeton subject headings:
Marche (Italy)--History--Congresses.