Columbia subject headings:
Griffoni, Matteo, 1351-1426--Congresses.
Harvard subject headings:
Bologna (Italy)--History--Congresses.
Griffoni, Matteo, 1351-1426--Congresses.
Princeton subject headings:
Bologna (Italy)--History--Congresses.
Griffoni, Matteo, 1351-1426--Criticism and interpretation--Congresses.