François de Castellane-Ornano-Adhémar de Monteil de Grignan, Duke of Termoli, Count of Grignan and Campobasso, Baron of Entrecasteaux and Knight of the King's Orders , made a career in the army and fought under the orders of Louis XIV.
His pleasant conversation and amiable character charmed his contemporaries and pleased Mademoiselle de Sévigné, daughter of the famous marquise.
Thus, in 1669, at the age of thirty-six, twice widowed, he married Françoise-Marguerite de Sévigné who moved into the castle in June 1671. The Count, who had become Lieutenant General of Provence, renovated the castle to receive guests, feast and shine ; he spent lavishly.
After his death in 1714, his daughter Pauline de Simiane was unable to meet her creditors' demands and had to sell the castle.
