English: Lady Mary Victoria Hamilton December 11, 1850 – Budapest, May 14, 1922) was the great-grandmother of Prince Rainier III of Monaco, the fashion designer Egon von Fürstenberg, and the socialite and actress Ira von Fürstenberg. She was the daughter of en:William Alexander Anthony Archibald Hamilton, 11th Duke of Hamilton and of his wife, Princess Marie Amelie Elizabeth Caroline of Baden. Her first marriage was to Albert I, Prince of Monaco, only child and heir of en:Charles III, Prince of Monaco. They were divorced on 28 July 1880. Mary Victoria bore Prince Albert a single son, Louis II, Prince of Monaco who would take the throne of Monaco upon his father's death. Her second marriage was to Count en:Tassilo Festetics von Tolna. It is through this marriage that the Fürstenbergs are descended.