The Augustinian priory here was founded in 1080, on land donated by the Alquier noble family of Béziers. A new church was consecrated in 1115. Numerous relics were collected by the abbey and it served as cemetery to the nobility of the region. The lands owned by the priory extended to 75 villages. Pope Innocent III in the context of the crusade against the Cathars exempted the priory from control by the bishops of Béziers, making it subject only to the Holy See in spiritual matters. In secular terms, the abbey pledged allegiance to Louis IX of France in 1268.
In the 14th century the priory began to decline, as a result of the Black Plague and the turmoils of the Hundred Year's War, and the number of monks halved, from 80 in the 13th century to 40 by 1384. The monastery was pillaged during the wars of religion, in 1539, and again in 1563. By 1605, the monastic community was moribund, reduced to seven or eight monks. In 1671, it was attached to Sainte-Geneviève abbey in Paris.
The medieval buildings were torn down and the estate was rebuilt from ground in the mid-18th century under prior Pas de Beaulieu, except for the church building, which was modified but retains its 12th century romanesque core structure. After the French revolution, the monastery was dissolved and the property nationalised, in 1791 sold to an advocate, Marc Antoine Thomas Mérigeaux, who bought it on behalf of a Prince de Conti who offered it to his mistress, Madame de Brimont.
From this point, the former monastery became known as Château de Cassan or Cassan castle. It changed hands several times during the 19th and 20th centuries, eventually passing to the French state, housing administrative offices, but in 1995 sold again to a private party, and in 2002 to a real estate holding.
References:Kakesbeck is one of the largest medieval fortifications in Münsterland and the oldest castle in Lüdinghausen. The imposingly grown complex originated in 1120 as a motte, a small hilltop tower castle. After numerous changes of ownership, the castle was extended onto two islands, but it was not until the 14th century that it underwent significant alterations and extensions under the von Oer family. The estate experienced its heyday in the middle of the 18th century, when it covered an area of almost one square kilometre and consisted of five further outer castles in addition to the core castle, which were secured by ramparts and moats.
The well-maintained condition of the castle today is thanks to the late Wilfried Grewing, the former lord of the castle. The foundation named after him has been particularly committed to preserving the property since 2020.