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
Louis II, Prince of Monaco Nazis. For a number of months in 1944, communists participated in the Liberation administration of Monaco and it is a moot point to debate how strong a position Louis II was in, in 1944, to resist any attempts to abolish the monarchy in Monaco. Following the liberation of Monaco by the Allied forces, the 75-year-old Prince Louis did little for his principality and it began to fall into severe neglect. By 1946, he was spending most of his time in Paris and on 24–27 July of that year, he married in Monaco for the first time. His wife was Ghislaine