Monaco succession crisis of 1918 of this event, pursuant to the clauses of the treaty of 17 July 1918." The French government at the time was still the Vichy regime. Louis II died on 9 May 1949. The Principality of Monaco passed to his grandson, Rainier III. In the absence of an heir male, the ducal titles of Valentinois and Estouteville became extinct in French nobiliary law. Before Rainier III married Grace Kelly in April 1956, he notified the French government of his plans; the French ministry of foreign affairs replied with a message of official congratulations. Count Louis de Causans is suing the French
Albert I, Prince of Monaco Association for the Physical Sciences of the Oceans established the Prince Albert I Medal in the physical and chemical sciences of the oceans in his honor. Albert I constituted a collection of postage stamps that was later continued by Louis II and finally remain part of the postal museum Rainier III created in 1950. Albert I, Prince of Monaco Albert I (13 November 1848 – 26 June 1922) was Prince of Monaco and Duke of Valentinois from 10 September 1889 until his death. He devoted much of his life to oceanography. Alongside his expeditions, Albert I made reforms on political,