In 1801 the dis-ennobled Duchess of Brissac by the state terms of receivership of aristocratic estates sold at the a permitted, reduced value Pontchartrain to the industrialist and speculator Claude Caroillon Destillières, a leader of the "Black Band" syndicate of businessmen enriched by the Directory who specialized in the purchase and liquidation of the great aristocratic estates.

He had the gardens transformed from the French style to that of an English park by the fashionable landscaper Louis-Martin Berthault, who was later employed in the 1820s by James Mayer de Rothschild to organize the first receptions he gave at his Paris hotel.
When Destillières died in 1814 his huge fortune and land holdings passed to his daughter, Aimée Caroillon des Tillières.

In 1817 Aimée married the dis-ennobled Count and then re-ennobled Marquis (1838) Rainulphe Eustache d'Osmond, aide to the Duke of Angoulême, whose older sister Adèle d'Osmond, Countess of Boigne,
spoke of the library at Ponchartrain in her memoirs.

The painter Jean-Baptiste Isabey, who taught Aimée d'Osmond drawing and was her friend, had his room in the chateau, where in 1815 he produced views of the interior.
In 1801 the dis-ennobled Duchess of Brissac by the state terms of receivership of aristocratic estates sold at the a permitted, reduced value Pontchartrain to the industrialist and speculator Claude Caroillon Destillières, a leader of the "Black Band" syndicate of businessmen enriched by the Directory who specialized in the purchase and liquidation of the great aristocratic estates.
He had the gardens transformed from the French style to that of an English park by the fashionable landscaper Louis-Martin Berthault, who was later employed in the 1820s by James Mayer de Rothschild to organize the first receptions he gave at his Paris hotel. When Destillières died in 1814 his huge fortune and land holdings passed to his daughter, Aimée Caroillon des Tillières.
In 1817 Aimée married the dis-ennobled Count and then re-ennobled Marquis (1838) Rainulphe Eustache d'Osmond, aide to the Duke of Angoulême, whose older sister Adèle d'Osmond, Countess of Boigne,
spoke of the library at Ponchartrain in her memoirs.
The painter Jean-Baptiste Isabey, who taught Aimée d'Osmond drawing and was her friend, had his room in the chateau, where in 1815 he produced views of the interior.
Château de Pontchartrain