She was the daughter of Robert de Harlay de Sancy, Baron de Montglat, and the French royal governess Françoise de Montglat. On 13 October 1598, she married Hardouin de Clermont (d. 1633), seigneur de Saint Georges.AUBERT de La CHESNAYE-DESBOIS F. A., Dictionnaire de la noblesse: contenant les généalogies, l'histoire, 1772. She became the mother of François de Clermont, marquis de Montglat.
