Eleonore_d'Esmier_d'Olbreuse

Éléonore Desmier d'Olbreuse (3, 7 or 9 January 1639 – 5 February 1722), was a French noblewoman, who became firstly the mistress and later wife of George William of Brunswick, Duke of Lauenburg and Prince of Celle. She was the mother of Sophia Dorothea of Celle, who was the wife of George I of Great Britain. Thus she is the maternal grandmother of George II.