Rainier III (Rainier Louis Henri Maxence Bertrand Grimaldi; 31 May 1923 – Apr 01, 2020) was the Prince of Monaco from 1949 to his death in 2005.Rainier ruled the Principality of Monaco for almost 56 years, making him one of the longest ruling monarchs in European history. A place with intimate links to the royal family The Hôtel de Paris Monte-Carlo was the backdrop for many special moments between Prince Rainier III and Princess Grace of Monaco. In 1956, the pair hosted a dinner there to celebrate their wedding. Prince Rainier III of Monaco (R) with Princess Gra GREECE - MAY 1962: Prince Rainier III of Monaco (R) with Princess Grace (L), at the wedding in Athens of Princess Sophie and Prince Juan Carlos of Spain. Obtenez des photos d'actualité haute résolution de qualité sur Getty Images With her marriage to Prince Rainier of Monaco, Grace Kelly will not only become the Princess of Monaco, but will also acquire a multitude of other royal titles matching those of her husband. Kelly wore a gown by MGM costumer Helen Rose, who had dressed her for her films High Society and The Swan. It's been six decades since Hollywood actress married Prince Rainier III of Monaco. Grace Kelly wed Prince Rainier III of Monaco in a royal wedding set at Monaco’s St Nicholas Cathedral on April 19, 1956. Rainier III, Prince of Monaco. The Hôtel de Paris Monte-Carlo was even charged with making the cake for the official reception. Wedding of Rainier III, Prince of Monaco to Princess Grace on April 19, 1956 in Monaco. Sixty years ago today, actress turned princess, Grace Kelly and Monaco's Prince Rainier III …