Columbia subject headings:
Harvard subject headings:
Architecture, Medieval--France--History.
Castles--France--History--To 1500.
Castles--France--History.
Fortification--France--History--To 1500.
Fortification--France--History.
France--History--Medieval period, 987-1515.
Historic buildings--France--History--To 1500.
Military architecture--France--History--To 1500.
Military architecture--France--History.
Princeton subject headings:
Castles--France--Design and construction.
Castles--France--History.