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
Prince's Palace of Monaco By 1946 he was spending most of his time in Paris, and on 27 July of that year, he married for the first time. Absent from Monaco during most of the final years of his reign, he and his wife lived on their estate in France. Prince Louis died in 1949 and was succeeded by his grandson, Prince Rainier III. Prince Rainier III was responsible for not only turning around the fortune and reputation of Monaco but also for overseeing the restoration of the palace. Upon his accession in 1949 Prince Rainier III immediately began a program of renovation and