"Princess Sophia Dorothea of Prussia (German: Sophia Dorothea Marie von Preußen) (25 January 1719 – 13 November 1765) was the ninth child and fifth daughter of Frederick William I of Prussia and Sophia Dorothea of Hanover. By marriage, she was a Margravine of Brandenburg-Schwedt." - (en.wikipedia.org 01.06.2020)
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