"Barbara Sophia of Brandenburg (16 November 1584 – 13 February 1636) was duchess of Württemberg by marriage to Duke John Frederick of Württemberg and acted as ...
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regent of the Duchy of Württemberg for their minor son, Duke Eberhard III of Württemberg, in 1631-1633. She was the daughter of the Catherine of Küstrin (1549–1602) and Elector of Joachim Frederick of Brandenburg." - (en.wikipedia.org 29.01.2020)
