Mary Victoria Douglas Hamilton
Lady Mary Victoria DouglasHamilton, also known as the Lady Mary Victoria Hamilton was the Lanarkshireborn, Scottish greatgrandmother of Prince Rainier III of Monaco, the fashion designer Prince Egon von Frstenberg, the socialite and actress Princess Ira von Frstenberg and the Czech Minister of Foreign Affairs Prince Karel Schwarzenberg. 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 Napolon III of France. She was a first cousin of Queen Carola of Saxony, Queen Stephanie of Portugal, King Carol I of Romania, and Princess Marie, Countess of Flanders .
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Source: Wikipedia