"Hedwig Sophia of Brandenburg (14 July 1623, Berlin - 26 June 1683, Schmalkalden) was Landgravine consort of Hesse-Kassel by marriage to William VI, Landgrave of Hesse-Kassel, ...
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and regent from 1663 until 1677 during the minority of her sons, William VII, Landgrave of Hesse-Kassel and Charles I, Landgrave of Hesse-Kassel." - (en.wikipedia.org 02.01.2021)
