The Château de Coucy is a French castle in the commune of Coucy-le-Château-Auffrique, in Picardy, built in the 13th century and renovated by Eugène Viollet-le-Duc in the 19th century.
During its heyday, it was famous for the size of its central tower and the pride of its lords, who adopted the staunchly independent rhyme: roi ne suis, ne prince ne duc ne comte aussi; Je suis le sire de Coucy.
Wikipedia https://en.wikipedia.org/wiki/Château_de_Coucy
Official Website http://www.culture.gouv.fr/public/mistral/merimee_fr?ACTION=
Coordinates 49°31'18.482" N 3°19'6.71" E