Châteaufort is a commune in the Yvelines department in the Île-de-France, France, about nine kilometers south of Versailles and 27 kilometers south-west of Paris.
Ramparts which only a few ruins, stood at the top of a steep hillside above a stream that flows into the Yvette.
This place was once considerable, in the tenth century and the eleventh century, chosen to be the capital of a district of the diocese of Paris. Châteaufort were two churches and a priory, one for the village, adjacent to the priory, one for peasants established outside the walls, at a place called La Trinité. The first is still the second is destroyed.
In the eleventh century, Guy de Montlhery was lord of Châteaufort and 1112, Hugues de Montlhery Grand Seneschal of France, his son, took the title.
In the twelfth century, Louis le Gros confiscated this land Hugues de Crecy.
In the thirteenth century there was a léproserie1.
In 1480, Louis XI gave the land to Châteaufort Louis de Brabant.
In 1529, Francis I gave it to Jean de la Barre.