Jeanne, called the Demoiselle de Luxembourg, was the sister of Count Waleran, and "very ancient" in 1430 according to Monstrelet. She was then at Beaurevoir "where governed Messire Jehan de Luxembourg, her nephew."

She had just inherited the seigneuries of her brother as the nearest heir of Philippe de Brabant, and took from that time the titles of Countess of Ligny and of St. Pol. "And because she loved her nephew so dearly" she left him most of her fiefs to the great discontentment of the lord of Enghien, his older brother.

This old lady was the sister of the illustrious saint, Pierre de Luxembourg, and was the godmother of Charles VII. She died at Boulogne sur mer on October 13, 1430. Jeanne de Bethune, Viscountess of Meaux, was the wife of Jean de Luxembourg, and was French in sympathy as far as one can learn.