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In page Princess Catherine of Württemberg:

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Catherine was the eldest of three children born to William I of Württemberg by his third wife and cousin Pauline Therese of Württemberg. Her two siblings were Charles I of Württemberg and Augusta, Princess of Saxe-Weimar-Eisenach. She also had two half-siblings from her father's previous marriage to Catherine Pavlovna of Russia: Marie and Sophie, the future Queen consort of the Netherlands.[citation needed]