Rainier III, Prince of Monaco Our Lady Immaculate, the resting place of previous sovereign princes of Monaco and several of their wives, and the place where Prince Rainier and Princess Grace had been married in 1956. Because his death occurred shortly after that of Pope John Paul II, Rainier's death was overshadowed in the media. "See also: List of titles of the Monegasque Crown" Rainier III, Prince of Monaco Rainier III (Rainier Louis Henri Maxence Bertrand Grimaldi; 31 May 1923 – 6 April 2005) ruled the Principality of Monaco for almost 56 years, making him one of the longest ruling monarchs in European history. Though
Rainier III, Prince of Monaco have been romantically involved with his second cousin, Princess Ira von Fürstenberg, a former actress turned jewellery designer, who is also a Fiat heiress and the former sister-in-law of fashion designer Diane von Fürstenberg. Princess Ira, like him, is a great-grandchild of Lady Mary Victoria Hamilton, the Scottish-German wife of Prince Albert I of Monaco, though by Lady Mary's second marriage. After Grace's death, Rainier refused to remarry. Rainier established a postal museum in 1950: the Museum of Stamps and Coins, in Monaco's Fontvieille district by using the collections of the Monegasque princes Albert I and Louis II. The prestigious