Columbia subject headings:
Feudalism--France--Mauritius.
Fortification--France--Mauritius--History.
Île-de-France (France)--Description and travel.
Île-de-France (France)--History.
Harvard subject headings:
Architecture, Medieval--France--Île-de-France.
Castles--France--Ile-de-France
Feudalism--France--Ile-de-France.
Fortification--France--Ile-de-France--History.
Île-de-France (France)--Description and travel.
Île-de-France (France)--History.
Military architecture--France--Île-de-France.
Military art and science--France--Île-de-France--History--Medieval, 500-1500.
Princeton subject headings:
Feudalism--France--Ile-de-France.
Fortification--France--Ile-de-France--History.
Île-de-France (France)--Description and travel.
Île-de-France (France)--History.