Columbia subject headings:
Castles--Europe--History.
Cities and towns, Medieval--Europe--History.
Europe--History--476-1492.
Middle Ages.
Harvard subject headings:
Castles--Europe--History.
Cities and towns, Medieval--Europe--History.
Europe--History--476-1492.
Middle Ages.
Princeton subject headings:
Castles--Europe--History.
Cities and towns, Medieval--Europe--History.
Europe--History--476-1492.
Middle Ages.