Timeline

Heritage classified

Key figures

Origin and history

The Montjoie Tower, located in Conflans-Sainte-Honorine in the Yvelines, is a medieval vestige of the 4th quarter of the 11th century, representing the first generation of stone castles in Île-de-France. Built in local Lutetian limestone, it combines defensive architecture (dry to the east, absence of bays on the north side) and residential (three levels, intra-mural chimneys). Its state of conservation remains remarkable, despite the disappearance of the roof and interior floors. The western and southern sides, restored in 1979-1980, have recovered their original geminous berries, surmounted by full-circle, tripartite tympanous arches, characteristic of primitive Romanesque art.

The original access, probably located on the first floor (south-east corner), reflects a defensive design: the occupants were covered in the event of an attack. The ground floor, without wide openings, housed a well and served as a reserve. The first floor, with three geminied windows and two chimneys, was the noble space, reserved for the lord, while the upper, soberer floor could accommodate his suite. The thinness of the walls (1.65 m) and the absence of foothills, compensated by the quality of the apparatus, underline the technical audacity of the period.

Certified as Mons Jovis (Mont de Jupiter), the tower may have replaced a wooden fortification. Its construction is sometimes attributed to Mathieu I of Beaumont, local count, after a conflict with Bouchard IV of Montmorency around 1100. Ranked a Historic Monument in 1997, it illustrates the transition between the castral mounds and the stone dungeons, marking the affirmation of seigneurial power in Île-de-France. The traces of 19th-century scaffolding and building, preserved during restorations, testify to medieval methods of construction.

Today, the Montjoie Tower stands on Rue de la Tour, although its immediate environment (fossed east, facing north) did not benefit from restorations. Its simple plan and interior arrangements (missing but suggested by the chimneys) make it a study model for the Franciscan castral architecture. Regional comparisons place its construction at the hinge of the 11th and 12th centuries, a period of strengthening feudal structures in the Paris basin.

External links