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
Honoré II, Prince of Monaco He was interred in the Cathedral of St. Nicholas (it stood on the location of the current cathedral) in Monaco. A collector's silver coin has been issued by the Treasury of Monaco portraying Honoré II on the occasion of the 400th anniversary (1612 - 2012) of the use of the title "Sovereign Prince" the silver coin has a €10 face value. Honoré II, Prince of Monaco Honoré II (24 December 1597 – 10 January 1662) was Prince of Monaco from 1604 to 1662. He was the first to be called Prince, but started his reign as Lord of Monaco. Honoré