L'Étanche Abbey is a former Premonstratensian monastery founded in the 12th century, the ruins of which are near the modern village of Deuxnouds-aux-Bois, in the commune of Lamorville.
The abbey of Notre-Dame de l'Étanche was founded in about 1144 by Philippe, abbot of Belval, in a secluded valley then known as Faverolles, near Deuxnouds-aux-Bois. The first patrons of the foundation were Albéron de Chiny, bishop of Verdun, and Bertrand le Loup and his nephew Albert, seigneurs of Faverolles, in whose lands the community was settled. The abbey church was consecrated in 1147. The earliest existing charter dates from 1157.
Nearby there was at first a Premonstratensian convent, which was dissolved in time. The modest abbey possessed a priory at Benoîte-Vaux, a famed place of pilgrimage in Lorraine.
The structures were utterly destroyed by the Swedes in 1632, during the Thirty Years' War, and were not rebuilt until 1743, with nine monastic cells in a range. The chapel was completed in 1770. Three abbés of L'Étanche were of note: Dom Dominique Callot, a student of chemistry and heraldry; Dom Edmont Maclot, author of pious works; and Dom Jean François Joseph Boucart, who assembled a collection of medals and a prestigious library, since dispersed.
References:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.