Robert married Beatrice, Duchess of Bourbon and together they had a son, Louis I, Duke of Bourbon, who was the founder of the House of Bourbon through his two sons. The elder line of the House of Bourbon was made up of the Dukes of Bourbon, and it became extinct in the male line in 1527. Meanwhile, the younger line of the House of Bourbon, the House of Bourbon-La Marche–later known as the House of Bourbon-Vendome, acquired the French throne in 1589 once the House of Valois became extinct in the male line.