Columbia subject headings:
Architecture, Medieval--Italy--Prato.
Castello dell'Imperatore (Prato, Italy)
Castles--Italy--Prato.
Prato (Italy)--Buildings, structures, etc.
Harvard subject headings:
Architecture, Medieval--Italy--Prato.
Castello dell'Imperatore (Prato, Italy)
Castles--Italy--Prato.
Prato (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Medieval--Italy--Prato.
Castello dell'Imperatore (Prato, Italy)
Castles--Italy--Prato.
Prato (Italy)--Buildings, structures, etc.