"George William (German: Georg Wilhelm; 13 November 1595 – 1 December 1640), of the Hohenzollern dynasty, was margrave and elector of Brandenburg and duke of Prussia ...
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from 1619 until his death. His reign was marked by ineffective governance during the Thirty Years´ War. He was the father of Frederick William, the "Great Elector"." - (en.wikipedia.org 29.10.2019)
