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.
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Count Philibert hasn't legitimate issue, but he has a bastard daughter, born in Piedmont, at the siege of Trino: Giacomo or Jacques, daughter of Countess Theresia de' Medici, granddaughter of don Antonio de' Medici via his son Antonfrancesco.
Married Claude-Charlotte, daughter of Philibert de Gramont and his wife, Elizabeth, daughter of Sir George Hamilton; died without issue and was succeeded by his brother John's son.
Nicolas Philibert | Philibert de Gramont | Gramont | Philibert of Jumièges | Philibert | Elizabeth, comtesse de Gramont | Agenor, duc de Gramont | Philibert-Emmanuel de Froulay, chevalier de Tessé | Emmanuel Philibert | Claude-Philibert Barthelot, comte de Rambuteau | Bullant's ''Galerie'' over Philibert Delorme | Antoine III de Gramont | Agénor, 11th ''duc de Gramont'' |
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.