Donation of the seigneury of Mons 1214 (≈ 1214)
Philippe Auguste offered Mons to Guérin, bishop of Senlis.
XIIIe siècle
Foundation of the castle
Foundation of the castle XIIIe siècle (≈ 1350)
Construction by Guérin, bishop of Senlis.
XVe siècle
Reconstruction of the castle
Reconstruction of the castle XVe siècle (≈ 1550)
Rebuilding after medieval destruction.
XVIe siècle
Reconstruction after the Hundred Years War
Reconstruction after the Hundred Years War XVIe siècle (≈ 1650)
Castle partially rebuilt after destruction.
1807
Acquisition by the Delfau de Pontalba
Acquisition by the Delfau de Pontalba 1807 (≈ 1807)
Beginning of the troubadour neogothic transformations.
1840
Romantic renovation
Romantic renovation 1840 (≈ 1840)
Facades and park redesigned.
Années 1880-1890
Latest major changes
Latest major changes Années 1880-1890 (≈ 1885)
Works by architects Clément and Louis Parent.
1989
Historical Monument
Historical Monument 1989 (≈ 1989)
Protection of facades and chapel.
Années 1990
Partial restoration
Partial restoration Années 1990 (≈ 1990)
Protection after abandonment of the 1970s-1980s.
2016
Restoration of the chapel
Restoration of the chapel 2016 (≈ 2016)
First public works campaign.
Aujourd'hui
Aujourd'hui
Aujourd'hui Aujourd'hui (≈ 2025)
Position de référence.
Heritage classified
Façades and roofs of the castle itself, the 18th century wing and the chapel; library of the castle (cad. F 287-289): entry by order of 28 June 1989
Key figures
Guérin - Bishop of Senlis (1213-1227)
Founded the castle after Bouvines.
Philippe Auguste - King of France (1180-1223)
Offered the lordship of Mons to Guérin.
Famille Delfau de Pontalba - Owners since 1807
Turned the castle into a troubadour style.
Alexandre Lenoir - Architect and curator (1761-1839)
Saved the stones of the Great Carmelites of Metz.
Joséphine de Beauharnais - Former Jube Owner
Cedade the elements to Mount the Bishop.
Joseph-Xavier Delfau de Pontalba - Owner (from 1807)
Turned the castle into a troubadour style.
Clément Parent et Louis Parent - Architects (late 19th century)
Complete the transformation of the castle.
Armand de Roquelaure - Last resident bishop
The castle was occupied before the Revolution.
Origin and history
The Château de Mont-l'Évêque came into being at the beginning of the 13th century, when King Philippe Auguste offered in 1214 the site of Mont-le-Roy to his Chancellor Guérin, then bishop of Senlis. The latter established an episcopal residence, marking the beginning of a long association between the place and the bishops of Senlis, which lasted until the French Revolution. The estate, adjacent to the Victoire Abbey founded by Guérin, becomes a symbol of local ecclesiastical power. The original buildings, partially destroyed over the centuries, were rebuilt in the 15th century, and then thoroughly rebuilt after 1840 by the Delfau family of Pontalba, who acquired the castle in 1807. This family, including Josephine de Pontalba, gives him his current appearance by adopting the troubadour style, a romantic current seeking to evoke an idealised Middle Ages.
The castle chapel, dated from the 15th century, houses a remarkable element: the jube du Carmel de Metz, saved by Alexandre Lenoir for the Musée des Monuments Français before being ceded to Josephine de Beauharnais. After his death, these pieces, which were left in crates, were sold and eventually joined the castle of Mont-l'Evêque. The estate is organized around a rectangular central space, surrounded by an English-style park built in the 19th century, where sheep are now grazing. La Nonette, which crosses the property, forms a lake decorated with swans, adding to the picturesque character of the places. Although the chapel, in poor condition, benefited from a first restoration campaign in 2016 thanks to a public subscription, the castle remains a private property whose only external visit is allowed.
The history of the castle is inextricably linked to the history of the municipality of Mont-l The village, located on the edge of the forest of Ermenonville, is marked by historical conflicts, such as the Wars of Religion (battle against the leaguers in 1589) or the Prussian looting of 1815. In the 20th century, the estate was integrated into the Chauvineau line, a defensive system built before the Second World War to protect Paris. A Shield block, intended to house an anti-tank gun, still remains near the forest.
Architecturally, the castle consists of three main buildings: the chapel and the central body, both redesigned in the 19th century, and an 18th-century wing once home to the administrative services of the diocese. The facades, decorated in troubadour style, contrast with the medieval internal structure, partially preserved since the 16th century. The park, once landscaped, now offers a bucolic setting where wood, meadows and hydraulic elements inherited from the Nonette are mixed. The family of Pontalba, still the owner, was able to preserve the romantic spirit of the place while adapting to successive times.
The castle of Mont-l-Vêque has been classified as a Historic Monument since 1989 for its facades, roofs and library of the castle. Although the indoor visit is not open to the public, the park and the outdoors make it possible to appreciate this rare testimony of troubadour architecture in Île-de-France. The chapel, being restored, and the defensive remains of the Chauvineau line recall the multiple historical strata of the site, from medieval origins to military issues of the 20th century.
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