Columbia subject headings:
Castles--England--History.
Castles--Wales--History.
England--Antiquities.
Fortification--England--History.
Fortification--Wales--History.
Great Britain--History, Military--1066-1485.
Wales--Antiquities.
Harvard subject headings:
Castles--England--History.
Castles--Wales--History.
England--Antiquities.
Fortification--England--History.
Fortification--Wales--History.
Great Britain--History, Military--1066-1485.
Wales--Antiquities.
Princeton subject headings:
Castles--England--History.
Castles--Wales--History.
England--Antiquities.
Fortification--England--History.
Fortification--Wales--History.
Great Britain--History, Military--1066-1485.
Wales--Antiquities.