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In page Princess Sophie of Saxe-Weimar-Eisenach (1888–1913):

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Sophie was born in Düsseldorf as the only daughter of Prince William of Saxe-Weimar-Eisenach and his wife Princess Gerta of Ysenburg and Büdingen in Wächtersbach.[citation needed] She was a great great granddaughter of Charles Augustus, Grand Duke of Saxe-Weimar-Eisenach, as well as a great granddaughter of William I of Württemberg. On her mother's side, Sophie was a great granddaughter of Frederick William, Elector of Hesse's morganatic marriage to Gertrude Falkenstein, Princess of Hanau.[citation needed]