Columbia subject headings:
Mediterranean Region--History.
Normans--Italy--Sicily--History.
Sicily (Italy)--History--1016-1194.
Sicily (Italy)--History--1194-1282.
Harvard subject headings:
Crusades
Mediterranean Region--History--1517-1789.
Mediterranean Region--History--476-1517.
Normans--Italy--Sicily--History
Normans--Italy--Sicily.
Sicily (Italy)--History--1016-1194
Sicily (Italy)--History--1194-1282
Princeton subject headings:
Crusades.
Normans--Italy--Sicily.
Sicily (Italy)--History--1016-1194.