Maison forte de Gourville, Medieval fortified house in Prunay-en-Yvelines, France

The Maison forte de Gourville in Prunay-en-Yvelines is a stone fortified house whose walls, watchtower and stacked interior levels served both defence and daily life. Guard rooms, kitchens and sleeping quarters are arranged across its floors. A northern wing added in the 17th century carries a four-sided roof that once served as a guardhouse.

The Maison forte de Gourville was built in the early 15th century for François de Brilhac, abbot of a Benedictine community near Chartres. It later passed to the bishops of Chartres and became their country residence, which changed both its function and its occupants.

The house takes its name from the Gourville family, its seigneurial owners. Look for the carved stone fireplaces in the main rooms, which served as the household's main source of heat and as a mark of rank; the kitchen hearth is the largest. The building later passed to the bishops of Chartres, who used it as a country residence.

The property is privately owned and visits require advance arrangements with the owner. Access is limited and varies throughout the year, so planning ahead is necessary before traveling there.

A northern wing was added during the 17th century and features a four-sided roof that once functioned as a guardhouse. This later addition demonstrates how building techniques and defense needs evolved from the original construction.