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In page Albertine of Brandenburg-Schwedt:

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Sophie Friederike Albertine of Bradenburg-Schwedt was born in Berlin on 21 April 1712 as the third daughter of Prince Albert Frederick of Prussia, Margrave of Brandenburg-Schwedt and Princess Maria Dorothea Kettler of Courland. Her mother was a daughter of Frederick Casimir Kettler, Duke of Courland and Semigallia and Countess Sophie Amalie of Nassau-Siegen. Her paternal grandparents were Frederick William, Elector of Brandenburg and Dorothea of Schleswig-Holstein-Sonderburg-Glücksburg.[citation needed]