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Origin and history

The Saint-Vaast church of Saint-Vaast-lès-Mello, located in the Oise region of Hauts-de-France, is a parish Catholic building built between the 12th and 13th centuries. Its nave, remarkable for its early arches of warheads (circa 1140), illustrates a transition between Romanesque and Gothic styles. Archaic capitals and grim-headed lamp-asses bear witness to this pivotal period. The early Gothic-style transept and apse date back to the first half of the 13th century, while the northern collateral, as high as the nave, underwent two subsequent reconstruction campaigns.

The nave, with an unusual narrowness (3.15 m), reveals architectural peculiarities such as blind high windows on the north side and warheads with rare profiles (almond-shaped blind). The western gate, richly decorated with broken sticks and violet flowers, contrasts with the general austerity of the building. The meridional portal, in enhanced hanger, has a unique plated archature decoration in the region, inspired by oriental models. These elements make the church a rare witness to the architectural experiments of Beauvais in the Middle Ages.

Ranked a historic monument in 1906, the church has suffered since 1937 from major structural problems, with supported arcades and internal formwork in the cross-section of the transept. Despite partial restorations (especially on the bell tower batteries), its condition remains precarious. Affiliated to the parish of Sainte-Claire de Mouy, it preserves remarkable furniture, including 12th-century baptismal fonts and a 16th-century log beam, classified as objects.

The history of the church remains poorly known, although its patronage belonged to the canons of Saint Lucian de Bury, who had it served by a perpetual vicar. There is no evidence linking the building to St. Vaast Abbey of Arras, despite its dedication to St. Vaast. Four major construction campaigns marked its evolution: the Romanesque nave (circa 1140), the transept and the abside (thirteenth century), the enhancement of the northern collateral (thirteenth–15th centuries), and late modifications (thirteenth century).

Outside, the western facade, composite, combines an 11th century wall with a late Romanesque portal. The croisillons and the choir, covered with limestone slabs, present buttresses and windows characteristic of primitive Gothic. The bell tower, with a built-up tower, dominates a non-bright transept, while the oriented chapels, vaulted in a broken cradle, recall regional models such as those of Santeuil or Séry-Magneval.

The interior, sober and stripped, is marked by ubiquitous arching, altering the perception of volumes. Among the oldest of the Oise, the dogive vaults of the nave fall on carved lamp-ends or Romanesque columns. The northern collateral, recognisable in the flamboyant period, preserves traces of mural paintings, while the choir, with an apse, houses a classic 18th-century altarpiece. Despite its fragile state, the church remains a unique example of the superimposition of medieval styles and constructive techniques.

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