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Origin and history

The ancient fortified enclosure of Mantes-la-Jolie, built between the 13th and 15th centuries, includes major defensive elements such as the Saint Martin Tower and the Poterne called Porte aux Prêtres. The tower, built in irregular rubble, adopts a 15 meters long horse-drawn iron plan, with thick walls of 4 meters. Its architectural features include yellow limestone links, machicoulis, and flamboyant wooden vaults on the ground floor and upstairs. Initially on the rampart to protect the priory of Saint Martin, it was transformed after the 18th century into a dwelling, then a storage place, before being abandoned. Its present state is degraded, invaded by vegetation, despite its inscription in the Historical Monuments in 1965 and its acquisition by the city in 2018.

The Saint Martin Tower plays a key role in local history, especially during the liberation of Mantes in 1449. Under English occupation (1419–49), the inhabitants seized the tower to allow the entry of French troops, marking the end of the siege. Reshuffles were attested in 1476, with local masons working to repair the building, already built with poor quality materials. The proposed construction dates vary between 1433 and 1446, depending on the sources (Lavall, 1997; chronicle d'Aubé, 1718–1719). The tower, now in retreat from rue des Martraits, bears witness to medieval military architecture and Franco-English conflicts in Île-de-France.

The "Porte aux Prêtres" Poterne, dated from the 13th century, completes this defensive ensemble. Both elements (door and tower) have been protected since the 1950s–60s: the poterne in 1955 and the tower in 1965. Their preservation remains an issue, the accuracy of their location being considered "passable" (note 5/10). GPS coordinates are located near 34 rue des Martraits, although the official address also mentions Rue des Tanneries and Quai des Cordeliers. A communal property, the tower is not open to visit because of its state of abandonment.

The study by Nicolas Faucherre (2000) reveals technical details, such as the cannons and the cloves of the vaults, typical of the flamboyant style. The subsoil and floor, which are very denatured, have been the subject of a hypothetical reconstruction. The materials used — all-way bellows and yellow limestone — reflect the constraints of the time, particularly during repairs in 1476, where the lack of quality stones is documented. The tower thus illustrates the challenges of preserving the medieval heritage, between natural degradation and successive transformations.

The historical context of Mantes-la-Jolie in the 15th century was marked by the Franco-English wars, with prolonged occupation (1419–1449). The city, strategic on the Seine, undergoes sieges and reconstructions, as evidenced by the Saint-Martin Tower. After the partial destruction of fortifications in the 18th century, the remains became utility spaces before being recognized as monuments. Their late registration (XX century) underscores growing heritage interest, although their accessibility remains limited.

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