In 1956, the world watched as American actress Grace Kelly married Prince Rainier of Monaco. It was one of the first major media events surrounding a celebrity marriage, comparable only to the hype of Queen Elizabeth II's marriage to Prince Philip. But Grace Kelly's marriage had far deeper implications than just a man marrying a woman. But joining her wealthy family with the royal family of Monaco, she essentially insured the tiny principality's future prosperity. And one man was responsible for the whole affair.