"Augustus of Saxe-Weissenfels (Dresden, 13 August 1614 – 4 June 1680, Halle), was a Duke of Saxe-Weissenfels-Querfurt of the House of Wettin and administrator of the ...
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Archbishopric of Magdeburg.
He was the fourth (but second surviving) son of John George I, Elector of Saxony, and his second wife, Magdalene Sibylle of Prussia." - (en.wikipedia.org 29.01.2020)