-- 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.
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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".