Columbia subject headings:
Architecture, Medieval--Great Britain.
Castles--Great Britain.
Great Britain--Antiquities.
Great Britain--Social life and customs--1066-1485.
Harvard subject headings:
Architecture, Medieval--Great Britain.
Aristocracy (Social class)--Great Britain.
Castles--Great Britain
Fortification--Great Britain.
Great Britain--Antiquities.
Great Britain--History, Military--1066-1485.
Great Britain--Social life and customs--1066-1485.
Princeton subject headings:
Aristocracy (Social class)--Great Britain--History.
Castles--Great Britain--History.
Fortification--Great Britain--History.
Great Britain--History, Military--1066-1485.