Columbia subject headings:
Italy--History--1268-1492.
Middle Ages.
Sicily (Italy)--History--1194-1282.
Sicily (Italy)--History--1282-1409.
Harvard subject headings:
Italy--History--1268-1492.
Middle Ages.
Sicily (Italy)--History--1194-1282
Sicily (Italy)--History--1282-1409
Princeton subject headings:
Italy--History--1268-1492.
Middle Ages.
Sicily (Italy)--History--1194-1282.
Sicily (Italy)--History--1282-1409.