Dorothea Sibylle of Brandenburg

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 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". She also played a crucial role in her husband's conversion to Calvinism in 1613.

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)