Châteauneuf-en-Thymerais is a commune Eure-et-Loir department in northern France. The commune was once an important stronghold reigning over the whole natural and historic province of Thymerais. Born of the fierce determination of his first lords to face the threat weighed the Duke of Normandy on the Kingdom of France, and devastated much debated over the ages, the castle was eventually demolished, but the city remained. It gradually lost its importance and the feud was the center of which she was dismembered so that it became a barony in the eighteenth century was far from having the same extent in the thirteenth century.