Born of the fierce determination of its first lords to face the threat brought by the Duke of Normandy upon the Kingdom of France, and devastated and much fought over through the ages, the castle that rose out of it was eventually demolished, but the city remained.

The city known since the end of the Second World War subsequently went through a fragile revival by taking advantage of its location due to its proximity to Paris, and the employment areas of Chartres and Dreux.

It managed to attract some industrial enterprises to retain part of its business while achieving a low but steady demographic development.

Former capital of Thymerais having taken over this status from its neighbor Thimert, Châteauneuf-en-Thymerais is located south of Normandy and Drouais, west and north of the Beauce and Chartrain and east of the Perche .

It was reconstructed by Gaston, brother of Albert Ribaud built a short distance in a clearing in the woods, a fort named Chastel-neuf.

The castle was again attacked by Henry II of England, who burned the fortress, but it was rebuilt in 1189 by Hughes III du Chatel, lord of Thymerais.

Hughes III received the castle from King Louis VII of France on the occasion of the inauguration of the fair of Saint-Jacques Boutaincourt.

On the death of Charles IV of Alençon in 1525, the king seized their land, most of which had been given to its prerogative and ancestors had, for lack of male descendants, returned to the Crown under the law of appendages.

This was divided among the heirs of Françoise d'Alençon, who took Champrond and Châteauneuf[7] and Louis de Gonzague, grandson of Anne of Alençon, Marquise of Montferrat (now the same year by the Duke of Nivernais marriage with Henriette of Cleves) received the cities, towns and castellanies Senonches and Brezolles en Thimerais which were detached from the barony of Châteauneuf.

The last traces of them were erased in the first half of the twentieth century to make way for new roads (including the streets of Pont Tabarin, Petite Friche, and Dulorens).

They left in 1966 upon the withdrawal of French forces from the NATO Command, as decided by De Gaulle, in effect expelling all U.S. bases from the country.