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.

Life
[edit]Born in Berlin, Dorothea Sibylle was the fourth and youngest daughter of her parents. After her father died in 1598, she grew up in her mother's estate, Crossen (in present-day Poland).
On 12 December 1610, Dorothea Sibylle married her maternal cousin, Duke John Christian of Brieg. She was described as "kind, and religious".[1] She also played a crucial role in her husband's conversion to Calvinism in 1613.[2]
Dorothea Sibylle and John Christian had the following children: George III (4 September 1611 - 4 July 1664), Joachim (20 December 1612 - 9 February 1613), Henry (3 February 1614 - 4 February 1614), Ernest (3 February 1614 - 4 February 1614), Anna Elisabeth (23 March 1615 - 28 March 1616), Louis IV (19 April 1616 - 24 November 1663), Rudolf (6 April 1617 - 8 February 1633), Christian (9 April 1618 - 28 February 1672), August (18 March 1619 - 12 March 1620), Sibylle Margareta (20 June 1620 - 26 June 1657), Dorothea (16 August 1622 - 26 August 1622), Agnes (16 August 1622 - 3 September 1622), Sophia Magdalena (14 June 1624 - 28 April 1660).