Columbia subject headings:
Byzantine Empire--Civilization.
Muslims--Italy--Sicily.
Normans--Italy--Sicily.
Palermo (Italy)--History.
Harvard subject headings:
Byzantine Empire--Civilization.
Muslims--Italy--Sicily.
Normans--Italy--Sicily.
Palermo (Italy)--History.
Princeton subject headings:
Byzantine Empire--Civilization.
Muslims--Italy--Sicily.
Normans--Italy--Sicily.
Palermo (Italy)--History.