Columbia subject headings:
Italy--History--Germanic rule, 962-1268.
Naples (Kingdom)--History--1016-1268.
Sicily (Italy)--History--1016-1194.
Harvard subject headings:
Naples (Kingdom)--History--1016-1268.
Sicily (Italy)--History--1016-1194
Princeton subject headings:
Italy--History--Germanic rule, 962-1268--Collected works.
Naples (Kingdom)--History--1016-1268--Collected works.
Sicily (Italy)--History--1016-1194.