Columbia subject headings:
Harvard subject headings:
Italy, Southern--History--535-1268--Early works to 1800.
Normans--Italy--Sicily--History--Early works to 1800.
Sicily (Italy)--History--1016-1194--Early works to 1800.
William I, King of Sicily, 1120?-1166--Early works to 1800.
William II, King of Sicily, 1153 or 1154-1189--Early works to 1800.
Princeton subject headings:
Italy, Southern--History--535-1268--Early works to 1800.
Normans--Italy--Sicily--History--Early works to 1800.
Sicily (Italy)--History--1016-1194--Early works to 1800.
William I, King of Sicily, 1120?-1166--Early works to 1800.
William II, King of Sicily, 1153 or 1154-1189--Early works to 1800.