The article about the French writer is at Madame de Lafayette

Marie Adrienne Françoise de Noailles, madame de La Fayette (2 November 1759 – 24 December 1807). She was born in Paris at the family home, the Hôtel de Noailles. Known as Mademoiselle d'Ayen-she was the second daughter of the duc d'Ayen, a powerful French noble-prior to her marriage to Gilbert du Motier, marquis de La Fayette, in the chapel of the Hôtel de Noailles on April 11, 1774. The couple lived there for the first few years of their marriage. They had four children.