The medieval castle fortress was altered for the first time in the 16th century, then transformed in the 17th century into a luxurious residence by the illustrious François de Castellane Ornano Adhémar de Monteil, Duke of Termoli, Count of Grignan and Campobasso, Lieutenant General to the Sun King in Languedoc then in Provence. Despite a prestigious career and glorious feats of arms (the taking of Orange and the saving of Toulon) in the service of Louis XIV, he will remain for posterity the son-in-law of the Marquise de Sevigne.
Badly damaged during the Revolution, the chateau was patiently restored by later owners, then acquired by the town of Grignan in 1979. It has been classed a historic monument since 1993.
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