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Origin and history

The Grand Deanné, also known as the Subligny mansion, is a medieval civil building located in Avranches (Manche, Normandy). Built around the middle of the 12th century for Hasculf de Subligny, local lord and brother of Bishop Richard de Subligny, it illustrates Norman aristocratic architecture of the time. This 230-m2 seigneurial hall, with a vaulted cellar and a spiral staircase, served as an ostentatious residence to affirm the power of the Sublignys in an urbanly booming episcopal city.

In the 13th century, the building passed under ecclesiastical control after the decline of the Subligny family. After becoming the seat of the Dean of Avranches, he underwent major changes: the division of the large hall into two levels (15th century), the addition of a kitchen and fireplaces, and the redevelopment of a private hotel in the 18th century under the impetus of Dean Charles Colin de Contrisson. The south facade was rebuilt in 1762, while the adjacent Petit Deanné, built after 1270, was destroyed between the 18th and 19th centuries.

Ranked a historic monument in 2007, the Grand Deanné retains remarkable elements such as its 15th century structure, its 18th century woodwork, and its medieval cellar that served as a prison during the Revolution. Studyed since the 2000s, it is considered a "major element of Norman architectural heritage", a witness to the changes from a seigneurial residence to an ecclesiastical building, then to a national good. Its history reflects the political and social upheavals of Normandy, from the Plantagenet period to the French Revolution.

The building also played a role during World War II, temporarily sheltering valuable manuscripts from the Avranches Library in 1940. Spared by the 1944 bombings, it is now a place to visit on Heritage Days. Its architectural features—medieval north wall, flat foothills, and traces of painted coatings—make it a unique example of a Romanesque urban mansion in Lower Normandy, comparable to the Cheque Room in Caen.

Recent excavations and research (2013) revealed details of its original manorial complex, including a seigneurial chamber block now extinct, medieval cuisine, and walled accesses to the Petit Deanné. These discoveries confirm his status as a secular aristocratic residence before his conversion into a religious building, stressing his importance in the urban history of Avranches, a strategic city between episcopal power and seigneurial authority.

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