High Quality Content by WIKIPEDIA articles! Lady Mary Victoria Douglas-Hamilton (Hamilton Palace, 11 December 1850 Budapest, 14 May 1922) was the Lanarkshire-born, Scottish-German-French 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 William Alexander Anthony Archibald Hamilton, 11th Duke of Hamilton and of his wife, Princess Marie Amelie Elizabeth Caroline of Baden. Through her maternal grandmother, she was a third cousin of Emperor Napoléon III of France. She was a first cousin of Queen Carola of Saxony, Queen Stephanie of Portugal, King Carol I of Romania, and Countess Marie of Flanders (mother of King Albert I of the Belgians).