Columbia subject headings:
Castles--France--History--To 1500--Congresses.
Cities and towns, Medieval--France--Congresses.
Cities and towns--France--History--To 1500--Congresses.
Fortification--France--History--To 1500--Congresses.
Harvard subject headings:
Castles--France--History--Congresses.
Cities and towns--France--History--Congresses.
City planning--France--History--To 1500--Congresses.
France--Buildings, structures, etc.--Congresses.
Princeton subject headings:
Castles--France--History--Congresses.
Cities and towns--France--History--Congresses.
City planning--France--History--To 1500--Congresses.
France--Buildings, structures, etc.--Congresses.