Columbia subject headings:
Guidi, Counts of.
Nobility--Italy--Tuscany--History--To 1500--Sources.
Tuscany (Italy)--History--To 1434--Sources.
Harvard subject headings:
Guidi, Counts of.
Nobility--Italy--Tuscany--History--To 1500--Sources.
Tuscany (Italy)--History--To 1434--Sources.
Princeton subject headings:
Guidi, Counts of.
Nobility--Italy--Tuscany--History--To 1500--Sources.
Tuscany (Italy)--History--To 1434--Sources.