Columbia subject headings:
Architecture, Norman--Great Britain.
Castles--Great Britain.
Harvard subject headings:
Architecture, Norman--Great Britain.
Castles--Great Britain
Great Britain--History, Military--1066-1485.
Great Britain--History--Norman period, 1066-1154.
Normans--Great Britain.
Princeton subject headings:
Architecture, Norman--Great Britain.
Castles--Great Britain.
Great Britain--History, Military--1066-1485.
Great Britain--History--Norman period, 1066-1154.
Military history, Medieval.
Normans--Great Britain.