Columbia subject headings:
Robert Guiscard, Duke of Apulia, Calabria, and Sicily, approximately 1015-1085.
Harvard subject headings:
Robert Guiscard, Duke of Apulia, Calabria, and Sicily, approximately 1015-1085--Congresses.
Princeton subject headings:
Church architecture--Italy, Southern--Congresses.
Italy, Southern--Civilization--Congresses.
Italy, Southern--History--535-1268--Congresses.
Normans--Italy, Southern--History--Congresses.
Robert Guiscard, Duke of Apulia, Calabria, and Sicily, approximately 1015-1085--Congresses.