Who dated Clara Elisabeth von Platen?

Clara Elisabeth, Countess von Platen-Hallermund (14 January 1648 – 30 January 1700, Schloss Monplaisir, in what is now the Von-Alten-Garten in Hannover), was a German noblewoman, most notable as the mistress of Ernest Augustus (Elector of Hanover, father of George I of Great Britain) and for her involvement in the Königsmarck affair.

Ernest Augustus (German: Ernst August; 20 November 1629 – 23 January 1698), Duke of Brunswick-Lüneburg, was Prince of Calenberg from 1679 until his death, and father of George I of Great Britain. He was appointed as the ninth prince-elector of the Holy Roman Empire in 1692.

He was also ruler of the Prince-Bishopric of Osnabrück from 1662 until his death.