"Catharina von Wartenberg née Rickert (Emmerich, 1674 – The Hague, 1734), known as "Catharina, Reichsgräfin von Wartenberg" or Madame de Wartenberg, was the official royal mistress ...
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of king Frederick I of Prussia between 1696 and 1711." - (en.wikipedia.org 31.01.2022)
