Columbia subject headings:
Canossa (Italy)--History.
Fortification--Italy--Canossa.
Harvard subject headings:
Castello di Canossa (Canossa, Italy)
Castles--Italy--Emilia-Romagna.
Emilia-Romagna (Italy)--Buildings, structures, etc.
Fortification--Italy--Emilia-Romagna.
Matilde, di Canossa, contessa, 1046-1115.
Princeton subject headings:
Archaeology, Medieval--Italy--Canossa.
Canossa (Italy)--Buildings, structures, etc.
Canossa (Italy)--History.
Castello di Canossa (Canossa, Italy)
Fortification--Italy--Canossa.