According to Count Philibert de Gramont, Antoine's brother, their father, also "Antoine de Gramont", viceroy of Navarre, was a bastard daughter of king Henry IV by Diane d'Andoins, knowns as "La Belle Corisande".
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His younger brother was Philibert, comte de Gramont (1621–1707), renowned for his memoirs describing the love affairs on the English court of Charles II, edited by Antoine Hamilton.
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His father was Antoine II de Gramont, his mother was Louise († 1610), daughter of Marshal Roquelaure (1543–1623).
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His memoirs („Mémoires du maréchal de Gramont“, Paris 1716) were published by his son Antoine Charles IV de Gramont.
His sister was Catherine Charlotte, (1639–1678), Princess of Monaco and one time mistress of Louis XIV of France.
-- Countess of Gramont and --> The Countess of Guiche, and called "the beautiful Corisande", she was known for having been a royal mistress of King Henri III of Navarre (the future Henri IV of France) between 1582 and 1591.
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Emancipated on 6 August 1567 (at the tender age of 13), she was married on Thursday 21 November 1568 to Philibert of Gramont, Seneschal of Béarn, Count of Gramont and of Guiche, Viscount of Aster and of Louvigny, Lord of Lescure, and Governor of Bayonne (1552–1580) who was, at the time only 15 himself.
He was the son of Marshal of France Antoine V de Gramont and Marie-Christine de Noailles (1672–1748), daughter of Marshal of France Anne-Jules, 2nd duc de Noailles.
He afterwards served under his elder half-brother, Antoine, marshal de Gramont, and the prince de Condé.
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The grandson assumed that his father, Antoine II de Gramont, viceroy of Navarre, was the son of Henry IV, and regretted that he had not claimed the privileges of royal paternity.
Philibert de Gramont | Gramont | Elizabeth, comtesse de Gramont | Agenor, duc de Gramont | Antoine III de Gramont | Agénor, 11th ''duc de Gramont'' |
Her daughter Corisande Armandine Léonie Sophie de Gramont married Charles Bennet, 5th Earl of Tankerville, and another daughter, Aglaé Angélique Gabrielle de Gramont, was married in turn to Russian general Alexander Lvovich Davydov and French diplomat Horace Sébastiani.
Antoine de Castelnau was the son of Louis de Castelnau, baron of Castelnau, Miremont, Buanes and Bats,(1460–before 1529), and Susanne de Gramont (died after 1525).
The title Duke of Gramont (duc de Gramont) was a senior member of French peerage, dukedom and nobility.
Maria dei Principi Ruspoli (Rome, May 18, 1888 – Aix-en-Provence, August 6, 1976), married firstly in Paris, August 3, 1907 as his second wife Antoine XI, 11th Duc de Gramont (Paris, September 22, 1851 – Paris, January 30, 1925), without issue and secondly in Paris, July 23, 1934 as his first wife François Victor-Hugo (Fiesole, April 30, 1889 – Aix-en-Provence, December 29, 1981), great-grandson of Victor Hugo, without issue