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Origin and history

The Grandmesnil barn is a former Cistercian barn located in Campremy, Oise department, in the Hauts-de-France region. Built in the 1st quarter of the 13th century, it depended on the abbey of Froidmont, itself affiliated with Ourscamp. This building, which has been listed as a historical monument since 1988, is located in the hamlet of Grandmesnil, within a farm. Its location on the picard plateau, 144 meters above sea level, and near the Brunehaut roadway, an ancient Roman road, underscores its strategic role in the organisation of monastic lands.

The name Grandmesnil evokes an isolated farm, already present before the arrival of the monks. The site was probably occupied from the Gallo-Roman era, as evidenced by the villas discovered nearby and the ancient medals found. The barn was founded in 1142 after the donation of Odon de Grandmesnil, the local lord, who offered his land to the Abbey of Froidmont. The Cistercians developed a model farm, gradually extending their estate through successive donations until 1256.

The barn operated as a major agricultural centre, raising cattle, sheep and pigs, and producing cereals such as wheat and peas. In 1256, it housed 23 horses, 37 cows and 680 sheep, illustrating its economic importance. Royalties in kind (wheat, lambs, wax) and subsequent leases, such as that of 1492, show rigorous management. The 56-metre-long building is distinguished by its three parallel naves, its yellowish and limestone arches, and a unique structure in the region.

Architecturally, the barn combines solidity and economy of means, with square pillars without capitals and low dropural walls. The openings of the coasts, rare for the time, facilitated traffic. Nearby, a 15th century chapel and associated white chalk buildings completed the whole. Sold as a national property in 1790, the farm covered 350 hectares. Today, it remains an exceptional testimony of medieval monastic agriculture and its architectural heritage.

The site is part of a dense network of Cistercian barns, such as those of Gouy or Troussures, reflecting the clearing and development of the land by the monks. The local toponymy (land divides, Grandmesnil woods) recalls these ancient developments. The barn, although partially renovated, retains its gable is original and a remarkable internal structure, classified for its heritage and historical value.

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