Article 7 of the monarchical constitution of the First French Empire, promulgated 20 May 1804, established that upon extinction of the legitimate natural and adopted male, agnatic descendants of Napoleon I (1769–1821), and those of two of his brothers, Prince Joseph Napoléon (1768–1844) and Prince Louis Napoléon (1778–1846), the throne was to be awarded to a man selected by the non-dynastic princely and ducal dignitaries of the empire, as ratified by plebiscite. On 24 September 1806, the emperor's youngest brother, Jérôme Napoléon (1784–1860), was made a French prince, along with the future issue of his second marriage to Duchess Catharina of Württemberg, and he and his heirs were added into the succession.