"Agnes von Barby-Mühlingen was born 23 June 1540 in Barby to Wolfgang I. von Barby-Mühlingen (1502-1565) and Agnes von Mansfeld zu Mittel-Ort (1511-1558) and died 27 November 1569 in Bernburg, at the age of 29 years of unspecified causes. Agnes married Joachim Ernst von Anhalt-Dessau 3 March 1560 in Barby." (http://familypedia.wikia.com/wiki/Agnes_von_Barby-M%C3%BChlingen_%281540-1569%29)