Château de Dampierre for Sale: Antoni Calmon's Unfinished Dream

Seven months after Antoni Calmon's sudden death, his sister Magali is putting the Château de Dampierre, in the Aube, up for sale. The estate is partially listed as a Monument Historique, with a château attributed to François Mansart that was bought at auction for €675,000 in 2021, and in which its young owner invested €6 million over five years. It is now listed for €1,696,000 (>> View the listing from Denniel Immobilier). A look back at a revival that millions of you followed, and at what awaits whoever writes its next chapter.

Why the Château de Dampierre Is Being Sold

Antoni Calmon passed away during the night of March 13 to 14, 2026, following heart surgery. He was 40 years old and about to turn 41. An aesthetic physician based in Paris, the son of a farmer from Perpignan, in southern France, he had become, in just five years, one of the most internationally followed château owners in France.

In the episode published this Monday, November 2, on our YouTube channel, his sister Magali announces from Dampierre that the family has decided to sell. Her first instinct had been to try everything to keep the estate: grants, financing, various arrangements. But the realities of the inheritance, with the financial burden it brings, and the scale of what remains to be restored, won out over that resolve. The sale will also allow her to continue the professional activities she had built with her brother.

In the episode, she shares an anecdote that helped her make up her mind. Two weeks before his surgery, during one last dinner together, Antoni stopped her to say that if anything happened to him, the château should be sold. Dampierre had been his life's dream, not his sister's, and he didn't want to leave her with that burden. Her wish now is that Dampierre find someone who will look at it through her brother's eyes and want to continue its story.

Antoni Calmon, the Aesthete Who Became Dampierre's Owner at Auction

His sister recalls that Antoni had been drawing plans for his future château, and even his future horse, since childhood. He wanted a place to restore from top to bottom, somewhere to spend his weekends and vacations, ride horses, and host friends.

The opportunity arose in April 2021. Vacant for nearly eight years, the Château de Dampierre was put up for auction in a court-ordered sale, the result of a co-ownership dispute within the family that owned it. The surrounding land, sold off in the first lots, went quickly and for high prices. When the main lot, the château itself, came up, Antoni, assisted in the process by brothers Guillaume and Alexandre Denniel, was the only bidder. He won it for €675,000, the price of a studio apartment in Paris. What particularly won him over was the grand 17th-century staircase: he fell in love with it the moment he saw it.

He described himself with humility, not as a châtelain but as "a homeowner." An aesthete in both his profession and his life, he had a gift for seeing what others could not, whether in an abandoned monument or in the people around him.

At So Châteaux, we met him right from the start. Our first episode with him, shot before the restoration began, drew more than 3 million views: over 1.8 million on our French-language channel and more than 1.3 million on our English-language channel. Buoyed by this response, Antoni launched his own YouTube channel, entrusting us with the production of all its episodes, and it grew to more than 60,000 subscribers. He was often recognized on the street, and even at the airport, by viewers who thanked him for inspiring them.

You can also read the Château de Dampierre profile on our site.

History of the Château de Dampierre: A Thousand Years in Champagne

Dampierre, in the Aube, about thirty kilometers northeast of Troyes, was a leading seigneury and the seat of a châtellenie overseeing 70 fiefs. The estate passed through the hands of great dynasties: the Dampierre-Saint-Dizier family from the late 10th century, then the Dampierre-Flandre, the Châtillon, including Jacques Ier, admiral of France killed at Azincourt in 1415, and the Lannoy family.

In 1526, the seigneury was sold to Louis Picot, first president of the Cour des aides of Paris. This began a family history that would last nearly five centuries. The barony was raised to a marquisate around 1645; one of the descendants, a general in the armies of the Republic, died for France in 1793. Through a series of marriages, the estate later passed to the La Rochefoucauld family, then was sold in 1907 to Viscount Jean Beuret, a major collector of 18th-century furniture, who carried out significant renovations there.

In the 1930s, a branch of the original family, the Picot de Moras d'Aligny, bought back the château and kept it until 2021.

Architecture: A 15th-Century Châtelet and a Château Attributed to Mansart

It is this dialogue between two eras that makes Dampierre unique.

Visitors enter through a spectacular 18th-century gate, attributed to the school of Jean Lamour, the ironworker behind the gates of the Place Stanislas in Nancy, in northeastern France. It opens onto a 200-meter vista, flanked by two classical pavilions.

BeforeAfter

At the center stands the 15th-century châtelet: a square tower pierced by a vaulted gateway and flanked by four corner turrets, one of which houses a stone spiral staircase. Once preceded by a drawbridge, it controlled access to the old feudal château. It is one of the finest examples of fortification from that period in the region.

At the far end of the courtyard stands the 17th-century château, attributed to François Mansart. Its facade, roughly forty meters long, has eleven bays, three of which sit on a slightly projecting central section beneath a mansard roof "à la Mansart." The central dormer window, flanked by two flaming urns, alludes to the coat of arms of the Picot de Dampierre family. A grand front step marks each of the two facades, and the through-rooms give the whole building great natural light.

The interior's crown jewel is the grand staircase. Its cut-stone railing is carved with interlacing patterns, oak and laurel leaves, symbols of power and military glory, and medallions beneath a marquis's crown bearing the monogram of the Picot de Moras de Dampierre family.

In terms of heritage protection, the châtelet is listed as a Monument Historique. The château itself is not, with the exception of the main staircase and the former basement kitchens.

Restoring the Estate: €6 Million in Five Years

In five years, Antoni Calmon transformed the château's setting, always working with top artisans and respecting the history of the place:

• The entrance gate, restored in its historic colors, with its gilding. It was unveiled this fall, without him.

• The two entrance pavilions. The first, restored as a priority so he could live on-site during the renovation, has three bedrooms. The second, its mirror image, houses a winter garden, where he liked to host friends.

• The châtelet, entirely redone: structural work, roofing, plasterwork, oak windows, leaded-glass windows, shutters, solid wood flooring, and terracotta tile floors. The bulk of the work was completed in March 2026, just before his death; the finishing work and interior layout still remain to be completed.

BeforeAfter

• The stables, one restored, the other built from the ground up. An avid horseman since childhood, Antoni had made this one of his priorities.

BeforeAfter

• The grounds, fully restored: terraces, flower beds, fountains, a reflecting pool mirroring the château, a redesigned woodland, the planting of mature trees, and 15 km of irrigation network.

What Still Needs to Be Restored at the Château de Dampierre

The main building still awaits full restoration. Its original decor disappeared during the 20th century, and the interior has been carefully stripped back. On the ground floor, it includes a large through-hall, the grand staircase, two sitting rooms, a dining room, and a pantry; on the second floor, two large bedrooms and two smaller ones; on the third floor, four bedrooms, some with handsome 18th- and 19th-century fireplaces, and a linen room; on the fourth floor, a vast attic. In the basement, the old kitchen and large cellars. The estate's hydroelectric power plant also still needs to be restored.

Renovation work on the château was slated to begin in April 2026. An important point for a buyer: Antoni had already completed all the architectural work, and his vision for the château is fully laid out in blueprints. The documents exist.

Price and sale terms for the Château de Dampierre

The Château de Dampierre is being offered exclusively by Denniel Immobilier, the family firm run by brothers Guillaume and Alexandre Denniel, specialists in historic properties, who had already assisted Antoni Calmon with his auction purchase five years earlier.

• Price: €1,696,000 including fees, or €1,600,000 excluding fees (6% payable by the buyer)
• Size: approximately 1,500 m², 25 rooms including 12 bedrooms, sold unfurnished
• Grounds: 16 hectares of gardens and woodland
• Location: Dampierre, in the Aube department in northeastern France, near Troyes in the Champagne region, about 170 km from Paris

>> VIEW THE LISTING FROM DENNIEL IMMOBILIER (on Belles Demeures)

Who is the Château de Dampierre for?

The numbers speak for themselves: nearly €6.7 million invested between the purchase and the renovation work, for an estate now listed at just under €1.7 million (including agency fees). The buyer of the Château de Dampierre inherits a largely restored property, livable outbuildings, and equestrian facilities ready for immediate use.

In exchange, the heart of the estate still needs work, and it's no small undertaking. Dampierre is therefore suited to an enthusiast capable of taking on a large-scale restoration, ideally a horse lover, who can live in one of the pavilions during the work (or even in the châtelet, once the final finishing touches are complete) and rely on the plans already drawn up. Work on the listed portions is carried out under the supervision of French historic preservation authorities and may qualify for public funding.

Finally, there's a rare advantage: Dampierre is already known to millions of people in France and abroad, who have followed its revival step by step.

Magali doesn't yet know who will write the château's next chapter, but she knows her brother has left an indelible mark on it forever, and she hopes with all her heart that his successor will be as passionate and dedicated as Antoni. So do we.