Château de Clagny

The Château de Clagny was a French country house that stood northeast of the Château de Versailles; it was designed by Jules Hardouin-Mansart for Madame de Montespan between 1674 and 1680. Although among the most important of the private residences designed by this great architect, it was demolished in 1769 after years of neglect.
Its appearance can only be traced through the engravings made of it, and scattered references in the archives of the Bâtiments du Roi.
The Château de Clagny.
Louis XIV had bought the estate of Clagny from the "Hôpital des Incurables" of Paris in 1665. On 22 May 1674, Colbert's son submitted to him a plan designed by the young Mansart, who had used his family ties with the great François Mansart of the previous reign to make himself and his talents known at court. By 12 June, work was ordered to begin at once because Madame de Montespan was anxious to start planting the grounds that very fall. André Le Nôtre designed the layout of the gardens. In August 1675, Madame de Sévigné visited Clagny, which she described to her daughter:
The "orangerie", where the "little wood of oranges" wintered at Clagny, was a showpiece itself, paved with marble. In the gardens "cabinets de verdure" shaped into niches that held sculptures were clipped into the dense woods, fitted with trelliswork dadoes to fill in their sparse bases.
In a portrait painted by Henri Gascar, Madame de Montespan had herself painted while reclining on a baroque canopied couch, its curtains held up by carved cupids, with the barrel-vaulted "galerie" of Clagny visible behind her, as grand a piece of architecture as any to which a sovereign could yet lay claim. About 1680, Adam-Frans van der Meulen painted a landscape view of a "promenade en calèche" with Louis XIV, Queen Marie-Thérèse, Madame de Montespan, and the king's son and his wife, which includes in a single "coup d'œil" both Versailles and Clagny, showing how closely the two châteaux were located.
After the Marquise de Montespan was compromised in the notorious Affaire des Poisons, she was abandoned by the king for Mme de Maintenon, the governess of the marquise's children. As a result of her loss of status at court, she visited the house less and less. In 1685, the king formally made it over to her as a gift, partially for the sake of their eldest natural son, the beloved Duc du Maine. In June 1692, Madame de Montespan retired to a convent.
After Madame de Montespan.
At her death in 1707, the duc du Maine inherited Clagny, followed in time by his grandson, the Prince de Dombes, who as it turned out became the last of his line. The château reverted to the Crown in 1766.
By then, the château, which Madame de Sévigné estimated to have cost not less than two million livres, and to have kept 1200 workers occupied, suffered from years of neglect. It was virtually unoccupied for forty years, and the dampness of the surrounding environment greatly accelerated its deterioration.
Gradually, the "quartier nouveau" of the town of Versailles expanded to the edge of the estate of Clagny, nestling in the northern corner between the château and the "étang de Clagny", the pond in its park. In 1736, following an episode of "fièvre paludéenne", possibly malaria, in the "quartier Notre-Dame" of Versailles, it was decided to drain the pond and fill it in.
When the ownership of Clagny reverted to the Crown, Louis XV gave some eleven hectares at the edge of the estate to his very religious queen, Maria Leszczyńska, who used the land to establish an Ursuline convent which was built from 1767 to 1772 according to the designs of Richard Mique. The château was demolished in 1769. Some of its dressed stone was employed in constructing the nearby new convent and other stone found its way into the "hôtels particuliers" along the new "Boulevard de la Reine", built through the park in 1772. The park was further subdivided under the Second Empire; one part now hosts the Science division of the Versailles Saint-Quentin-en-Yvelines University and the "pavillon" Panhard.