Columbia subject headings:
Guidi, Counts of--History--Congresses.
Romagna (Italy)--History--Congresses.
Tuscany (Italy)--History--Congresses.
Harvard subject headings:
Feudalism--Italy--Romagna--History--Congresses.
Feudalism--Italy--Tuscany--History--Congresses.
Guidi family--Congresses.
Guidi, Counts of--History--Congresses.
Nobility--Italy--Romagna--History--Congresses.
Nobility--Italy--Tuscany--History--Congresses.
Romagna (Italy)--History--Congresses.
Tuscany (Italy)--History--To 1434--Congresses.
Princeton subject headings:
Guidi family--Congresses.
Nobility--Italy--Romagna--History--Congresses.
Nobility--Italy--Tuscany--History--Congresses.
Romagna (Italy)--Genealogy--Congresses.
Tuscany (Italy)--Genealogy--Congresses.