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In page Princess Amalie of Nassau-Dietz:

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Her father-in-law, Margrave Karl III Wilhelm, did not want Amalia influencing the new crown prince Karl Friedrich;[citation needed] though mother and son continued to live in Karlsburg Castle in Durlach, Amalia lived the rest of her life in a separate apartment in the castle, shielded from the outside world. The education of her two sons, Karl Friedrich and Wilhelm Ludwig, was taken over by her mother-in-law, Magdalena Wilhelmine of Württemberg.[1]