Columbia subject headings:
Frederick II, Holy Roman Emperor, 1194-1250.
Historic sites--Italy--Puglia--Guidebooks.
Puglia (Italy)--Guidebooks.
Harvard subject headings:
Architecture, Medieval--Italy--Puglia--Guidebooks.
Frederick II, Holy Roman Emperor, 1194-1250--Homes and haunts--Italy--Puglia--Guidebooks.
Puglia (Italy)--Guidebooks.
Princeton subject headings:
Frederick II, Holy Roman Emperor, 1194-1250.
Historic sites--Italy--Puglia--Guidebooks.
Puglia (Italy)--Guidebooks.