Columbia subject headings:
Harvard subject headings:
Conradin, Duke of Swabia, 1252-1268--History--Congresses.
Italy, Southern--History--535-1268--Congresses.
Italy--History--Germanic rule, 962-1268--Congresses.
Naples (Kingdom)--History--1016-1268--Congresses.
Princeton subject headings:
Sicily (Italy)--History--1194-1282--Congresses.
Sicily (Italy)--Politics and government--To 1282--Congresses.