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 In one incident, he even wrote personally to the Kaiser in an effort to ameliorate the consequences of Gen. Karl von Bülow's wrath. Without the Prince's intervention, the French villages of Sissonne and Marchais would have been destroyed. In the "Great War to End All Wars," Monaco declared its neutrality, but in fact, provided the Allied forces with hospitals, convalescent centers, and soldiers, including Prince Albert's only son, Louis. Albert died on 26 June 1922 in Paris, France and was succeeded by his son, Louis II. Prince Albert I of Monaco devoted much of his life to the study of