Preuilly Abbey, Cistercian monastery in Égligny, France

Preuilly Abbey is a Cistercian monastery situated on a plateau overlooking a valley, defined by a channeled spring and multiple fish ponds. The remaining structures display the layout of a typical cloister with a chapter house, service buildings, and agricultural facilities.

Founded in 1118 by Stephen Harding as Cîteaux's fifth daughter house, on land given by Theobald of Blois, with Arthaud as first abbot. It founded Vauluisant and Barbeau abbeys and briefly supervised La Colombe. Sacked and occupied by English troops in the 14th–15th centuries, it was plundered in 1567 and 1652, passed to commendatory abbots in 1536, and was dissolved in 1791.

The monastery shaped regional life as a spiritual and economic hub of the Cistercian order. Monks actively transformed the landscape by constructing fish ponds and managing surrounding lands.

The site sits on an isolated plateau with rural conditions, so visitors should dress appropriately for outdoor exploration. Ruins are partly overgrown with vegetation, making sturdy footwear advisable when moving around the grounds.

The Beauvais barn, a surviving monastic grange, is being studied by the Free University of Brussels under François Blary and Anne-Marie Flambart Héricher to understand the Cistercian economy. The abbey's 13th-century townhouse in Provins also survives, showing how the monks managed trade away from the rural site.