The second, Alexandre, comte de La Rochefoucauld (1767–1841), married Adélaïde de Pyvart de Chastullé, a San Domingo heiress allied to the Beauharnais family. Mme de La Rochefoucauld became "dame d'honneur" to the empress Josephine, and their eldest daughter married , a brother-in-law of Pauline Bonaparte, Princess Borghese. La Rochefoucauld became ambassador successively to Vienna (1805) and to The Hague (1808–1810), where he negotiated the union of the Kingdom of Holland with France. During the "Hundred Days" he was made a peer of France. He subsequently devoted himself to philanthropic work, and in 1822 became deputy to the Chamber of Deputies and sat with the constitutional royalists. He was again raised to the peerage in 1831.