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In page Princess Amalie of Nassau-Dietz:

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Anna Charlotte Amalia was the only daughter of Johan Willem Friso of Nassau-Dietz (after 1702 Prince of Orange) and his wife, Landgravine Marie Louise of Hesse-Kassel. She had a brother, William IV, Prince of Orange (1711-1751).[1] She grew up in Friesland and spoke West Frisian herself. Amalia was often described as quite introvert and often melancholic.[citation needed]