Dorothea Sibylle of Brandenburg

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Dorothea Sibylle of Brandenburg (German: Dorothea Sibylle von Brandenburg) (19 October 1590 — 9 March 1625) was a Duchess of Brieg by marriage. She was a daughter of John George, Elector of Brandenburg by his third wife, Elisabeth of Anhalt-Zerbst. She was also known as Duchess Dorothea Sibylla of Liegnitz and Brieg, and was born as the Margravine of Brandenburg.