Columbia subject headings:
Castles--Italy--Puglia--History.
Fortification--Italy--Puglia--History.
Puglia (Italy)--History.
Harvard subject headings:
Castles--Italy--Puglia--History.
Fortification--Italy--Puglia--History.
Puglia (Italy)--History.
Princeton subject headings:
Castles--Puglia.
Fortification--Italy--Puglia--History.
Puglia (Italy)--History.