approval, thereby limiting Monaco's sovereignty: "Measures concerning the international relations of the Principality shall always be the subject of prior consultations between the Government of the Principality and the French Government. The same shall apply to measures concerning directly or indirectly the exercise of a regency or succession to the throne, which shall, whether by marriage or adoption or otherwise, pass only to a person who is of French or Monégasque nationality and is approved by the French Government." Charlotte's adoption and status as heir presumptive Charlotte was formally adopted by her own father Louis at the Monégasque embassy in Paris on 16 May 1919, in the presence of her grandfather Albert I, the French president Poincaré, and the mayor of Monaco. There is a doubt on the legality of the adoption. The Monégasque civil code (articles 240 and 243) required that the adopting party be of at least age fifty and the adoptee of at least age twenty-one. The 1918 ordinance changed the adoptee's minimum age to eighteen (Charlotte was twenty at the time of adoption) but not the other age limit, Prince Louis then being only aged forty-eight. Charlotte was created Duchess of Valentinois by Albert I on 20 May 1919, and on 1 August 1922, following Louis II's accession on 26 June of that year, she was officially designated the Hereditary Princess of Monaco as her father's heir presumptive. In 1920 she married comte Pierre de Polignac, who belonged to a junior branch of a prominent French ducal family. Prior to the wedding, a Monégasque ordinance of 18 March 1920 had changed Pierre's name and coat of arms to those of Grimaldi. On 20 March, he was allowed to take the title of Duke of Valentinois (his French prefix of comte was, in fact, a courtesy title). Princess Charlotte, Duchess of Valentinois and Pierre Grimaldi had a daughter, Princess Antoinette, baroness de Massy, and then a son, Rainier, marquis des Baux. Duke Wilhelm von Urach, along with the other adult descendants of Princess Florestine, discussed renouncing their dynastic rights in 1924 in favour of a French cousin, Léonor Guigues de Moreton, comte de Chabrillan, who was descended from Prince Joseph of Monaco. The count was a more remote, female-line descendant of the Grimaldi dynasty, and was next in line to the Monégasque throne after the Urachs according to the pre-1920 order of succession. However, this renunciation was