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Origin and history

The Saint-Martin de Marquemont church, located in the eponymous hamlet of the commune of Monneville (Oise, Hauts-de-France), is a decommissioned building since 1860, the date of the transfer of the communal capital. Ranked a historical monument in 1934 for its "residues", it illustrates a stylistic transition between Roman art and Gothic. Its western portal, dated the second quarter of the 12th century, is a late Romanesque masterpiece, while its choir, rebuilt around 1240, is inspired by Saint Martin of Pontoise, now extinct. The nave, of Romanesque origin (XI–XII centuries), retains a rural simplicity, with stone walls and an apparent wooden ceiling.

Associated with a priory dependent on the Saint Martin Abbey of Pontoise, the church was partially renovated in the 16th century, notably by the addition of a flamboyant Gothic bell tower and the redesign of the cross of the transept. Disused after the Revolution, it fell into ruins in the 19th century, accelerated by the abandonment of the hamlet of Marquemont for the benefit of Monneville. In the 20th century, private restorations saved the nave and stabilized structures, revealing hidden elements such as a liturgical pool or carved capitals. The classified furniture is limited to the baptismal fonts of the thirteenth century, witnesses to its past parish use.

The building is distinguished by its irregular plan, without collaterals, and its sober yet elegant decor: slender warheads of the choir, Gothic bays with radiant fillings, and carved caps. The northern crusillon, illuminated by three trilobed lancet bays, served as a chapel, while the base of the bell tower, vaulted by dogives, presents an original architectural arrangement for the period. Outside, the Romanesque portal, once protected by a porch, features broken stick archvolts and partially eroded, leafed capitals. The bell tower, although not adorned, dominates the site with its glaci foothills and bays in the middle of the hanger.

The decline of Marquemont, sealed by the imperial decree of 1860, has frozen the church in a state of picturesque ruin, invaded by the ivy until recent restorations. The adjacent cemetery, enlarged in the 20th century after the demolition of the priory, recalls the old importance of the village. Today, a communal property, the church is a poetic vestige of the rural history of the French Vexin, where medieval memory and contemporary preservation efforts mix.

Archaeological sources, such as the works of Louis Régnier (1927), highlight the stylistic links between Marquemont and other Vexin buildings, suggesting a joint workshop for the region's Romanesque portals. The comparison with Pontoise's abbey, admired for its choir, illuminates the aesthetic choices of 13th century builders. Despite the mutilations (woodworks of the eighteenth century, suppression of stands), the church remains a major milestone in understanding the evolution of religious architecture in Picardia, between Romanesque tradition and Gothic innovations.

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