Columbia subject headings:
Castles--Italy--Basilicata--History.
Castles--Italy--Puglia--History.
Fortification--Italy--Basilicata--History.
Fortification--Italy--Puglia--History.
Italy, Southern--History--535-1268.
Military architecture--Italy, Southern--History.
Military history, Medieval.
Harvard subject headings:
Castles--Italy--Basilicata--History.
Castles--Italy--Puglia--History.
Italy, Southern--History--535-1268.
Princeton subject headings:
Basilicata (Italy)--Politics and government.
Castles--Italy--Basilicata--History.
Castles--Italy--Puglia--History.
Puglia (Italy)--Politics and government.