Rainier III, Prince of Monaco 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 internationally known for his marriage to American actress Grace Kelly, he was also responsible for reforms to Monaco's constitution and for expanding the principality's economy beyond its traditional casino gambling base. Gambling accounts for only approximately three percent of the nation's annual revenue today; when Rainier ascended the throne in 1949, it accounted for more than 95 percent. Rainier
Albert I, Prince of Monaco Association for the Physical Sciences of the Oceans established the Prince Albert I Medal in the physical and chemical sciences of the oceans in his honor. Albert I constituted a collection of postage stamps that was later continued by Louis II and finally remain part of the postal museum Rainier III created in 1950. Albert I, Prince of Monaco Albert I (13 November 1848 – 26 June 1922) was Prince of Monaco and Duke of Valentinois from 10 September 1889 until his death. He devoted much of his life to oceanography. Alongside his expeditions, Albert I made reforms on political,