Columbia subject headings:
Cities and towns--Italy--History--To 1500.
Cities and towns--Italy--Sicily--History--To 1500.
Italy--History--476-1492.
Sicily (Italy)--History.
Harvard subject headings:
Cities and towns--Italy--History--To 1500.
Cities and towns--Italy--Sicily--History--To 1500.
Italy--History--476-1492.
Sicily (Italy)--History--To 1500.
Princeton subject headings:
Cities and towns--Italy--History--To 1500.
Cities and towns--Italy--Sicily--History--To 1500.
Italy--History--476-1492.
Sicily (Italy)--History.