Columbia subject headings:
Cities and towns, Medieval--Italy--Sicily--History.
Sicily (Italy)--History--1016-1194.
Sicily (Italy)--History--1194-1282.
Social classes--Italy--Sicily--History.
Harvard subject headings:
Cities and towns, Medieval--Italy--Sicily--History.
Sicily (Italy)--History--1016-1194
Sicily (Italy)--History--1194-1282
Social classes--Italy--Sicily--History.
Princeton subject headings:
Cities and towns, Medieval--Italy--Sicily--History.
Sicily (Italy)--History--1016-1194.
Sicily (Italy)--History--1194-1282.
Social classes--Italy--Sicily--History.