Van wie was John George Iv, Elector Of Saxony?

Magdalena Sibylla of Neidschütz (8 February 1675 – 14 April 1694), later Countess of Rochlitz, was a German noblewoman and the mistress of John George IV, Elector of Saxony. She was the first ever Official Mistress (Favoritin) of an Elector of Saxony.