Louis II, Prince of Monaco
On 26 June 1922, Prince Albert I died in Paris. Louis Grimaldi ascended to the throne as Louis II, Prince of Monaco. While his reign never achieved the grandeur of his father, Louis II left an indelible imprint on the tiny principality. In 1924 the Monaco Football Club was formed and in 1929, the first Grand Prix of Monaco automobile race was held, won by Charles Grover (aka "Williams") driving a Bugatti painted in what would become the famous British racing green color. He collected artefacts belonging to Napoleon I which are now assembled and displayed in the Napoleon Museum attached to the Royal Palace in Monte Carlo.
Caroline, Princess of Hanover
Albert's lack of legitimate children until the 2010s prompted Prince Rainier III to change the constitution so as to ensure there would be a successor to the throne, which strengthened the places of Caroline and her descendants in the line of succession. On 2 April 2002, Monaco passed Princely Law 1.249, which provides that if the Sovereign Prince assumes the throne and then dies without a legitimate direct heir, the throne will pass to his dynastic siblings and their descendants according to the rule of male-preference cognatic primogeniture. The law was then ratified by France, as required by a 1918 Franco-Monégasque Treaty, on 4 October 2005. Before this change, the crown of Monaco could pass only to a descendant of the last reigning prince, excluding such collateral relations as siblings, nephews, and nieces.Caroline is usually referred to and addressed by the female form of the higher style attributed (by tradition) to her husband, i.e. "Her Royal Highness The Princess of Hanover", rather than by her own legal but lower title that, until 10 December 2014, was "Her Serene Highness The Hereditary Princess of Monaco". Historically, styles associated with kingdoms, such as Ernst August's, have been deemed of higher rank and status than those associated with principalities.