The daughter of Jobst Moritz von Offeln, in 1697 she married Ernst August, Count von Platen-Hallermund, who, according to serious historians, was the son of Ernst August, Elector of Hanover which made him the possible half-brother of the future George I, King of Great Britain. Her husband's sister, Sophie Charlotte, Countess von Kielmansegg, as mistress of King George I became Countess of Darlington. 
Count Philipp Christoph von Koenigsmarck was a friend of Karl Philipp, a younger son of the Elector of Hanover. As well he was an officer in the Hanoverian army, handsome, dashing and a ladies-man. Hoping to gain speedy promotion in the Hanoverian army, he started sleeping with Countess Platen as she was also an acknowledged mistress of the future George I, son and heir of the Elector of Hanover. 
However, Koenigsmarck stopped seeing her when he began his disastrous affaire with the wife of the same George, as this ended in divorce and imprisonment for George's wife and his own murder. 
George I, when he became King of Great Britain, wanted to take his collection of mistresses with him, but Countess Platen refused. She was the only one with some pretention to beauty but, as she was a Roman Catholic, she was determined to stay in Hanover. She also had heard about the horrible things the English did to their kings. As a result, George I took the Countess von Kielmansegg with him as well as Ehrengard Melusine von der Schulenberg who, for obvious reasons, became known as 'the Elephant' and 'the Maypole'. 
 

Source: Leo van de Pas