Catherine Henriette de Bourbon (also Catherine Henrietta de Vendôme, Duchesse d'Elbeuf)[1] (11 November 1596 – 20 June 1663) was an illegitimate daughter of King Henry IV of France and his long-term maîtresse en titreGabrielle d'Estrées.[2][3] She was declared legitimate on 17 November 1596 at the Abbey of St. Ouen in Rouen and married into the Princely House of Guise. In 1619 she married Charles de Lorraine, Duc d'Elbeuf.[2][4]