Columbia subject headings:
Cities and towns, Medieval--Italy--History.
Italy--History--Germanic rule, 962-1268.
Harvard subject headings:
Cities and towns, Medieval--Italy--History--Congresses.
Italy--History--Germanic rule, 962-1268--Congresses.
Italy--History--Germanic rule, 962-1268.
Princeton subject headings:
Cities and towns, Medieval--Italy--History.
Italy--History--Germanic rule, 962-1268.