Sibylla of Anhalt was a German princess from the House of Ascania who became Duchess of Württemberg as the wife of Duke Frederick I. Wikipedia
Born: September 28, 1564, Bernburg, Germany
Died: October 26, 1614 (age 50 years), Leonberg, Germany
Parents: Joachim Ernest, Prince of Anhalt and Agnes of Barby-Mühlingen
Great-grandparents: Joachim I Nestor, Elector of Brandenburg, Elizabeth of Denmark, Electress of Brandenburg, Margaret of Münsterberg, and more
Spouse: Frederick I, Duke of Württemberg (m. 1581)