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Origin and history

The church of Saint-Martin d'Ognon, located in the Oise department in the Hauts-de-France region, is a parish Catholic building whose present structure dates mainly from the seventeenth century. The unique vessel, completed in 1639, was accompanied by a 16th century lateral chapel, a former seigneurial chapel built by the La Fontaine family, lords of Ognon from 1479 to 1632. The western gate and the interior tombstones, including five engraved effigie funerary slabs classified in 1912, constitute the remarkable elements of this modest but historic building.

The reconstruction of the church in the 17th century was initiated under Lord Lécuyer, succeeding the La Fontaine family. The collator of the cure was then the bishop of Senlis, and the parish depended on the diocese of Senlis before being attached to that of Beauvais during the Revolution. The arching of warheads, of flamboyant Gothic style, is a late architectural peculiarity for the time, while the square of the Church, triangular and planted with linden trees, was inscribed as sites in 1944 for its picturesque and regional character.

The church, listed as a historic monument in 1970, houses modest but notable furniture, including a major 19th-century altarpiece representing Saint Martin's Charity and signed Arnaud Dorbec (1885). Funeral slabs, such as those of Nicolas de La Fontaine (1558) or Jean de La Fontaine and his wife (1577), bear witness to local seigneurial history. Today, the building depends on the parish of Saint-Rieul in Senlis and hosts occasional Masses, perpetuating its community role.

Architecturally, the church is distinguished by its seven short bays vaulted with warheads, an unusual number for its modest length. The curved windows, devoid of stained glass, illuminate a sober interior where the veins of the vaults penetrate directly into the walls. On the outside, the western facade of cut stone presents a classic portal with bosses and triangular pediment, adorned with an IHS monogram and heraldic remains hammered at the Revolution.

The seigneurial chapel, now the chapel of the Virgin, retains a key of armored vault painted in the 19th century and a third-point window. The outdoor setting, with its grassed square and wrought iron calvary, reinforces the rural charm of this monument. The church thus illustrates the architectural and social evolution of a village in the Oise, between medieval heritage and modern adaptations.

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