Donjon de Jouy, Medieval keep in Sancoins, France.

Donjon de Jouy is a medieval keep in Sancoins with three corner towers rising about 27 meters (89 feet) high. A winding stone staircase runs through its interior walls, providing access to the different levels of the structure.

Pierre de Courtenay transformed the site into a powerful fortification in 1191, building upon ancient Roman foundations and the remains of a former monastery. This layering of Roman and religious history created the foundation for what became a significant military stronghold in the region.

The name Jouy comes from the Latin Joviacum, and the site passed from the counts of Sancerre to Pierre de Giac, chancellor of France from 1379 to 1388, who remodelled the keep into a seigneurial residence. East of the keep, remains of a fireplace mantel carved with the arms of Louis Malet, admiral of France, recall the later use of the site as a hunting retreat.

The keep is a protected historical monument and visits are arranged through local tourism services. Checking ahead for available tours and opening hours will help you plan your visit properly.

Many houses in the surrounding neighborhood were built using stones from the original castle complex. This reuse of building materials shows a practical connection between the medieval structure and the community's later development.