"William IV of Hesse-Kassel (24 June 1532 – 25 August 1592), also called William the Wise, was the first Landgrave of the Landgraviate of Hesse-Kassel (or ...
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Hesse-Cassel). He was the founder of the oldest line, which survives to this day." - (en.wikipedia.org 30.01.2020)
