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Éléonore d'Olbreuse (January 3, 1639 – February 5, 1722) was Duchess of Celle as the wife of Duke George William. Born the scion of a Huegenot aristocratic family, Éléonore bore her husband one daughter, Sophia Dorothea, who married her first cousin George Louis, Elector of Hanover and, later, King of Great Britain and Ireland.

Life
The daughter of Alexandre II d'Esmier d'Olbreuse and Jacquette Poussard du Bas-Vandré, Éléonore was born on 3 January, 1639, at Château d'Olbreuse, Poitou. Of a long line of Protestant aristocrats,

Éléonore d'Esmier d'Olbreuse was born at the castle of Olbreuse in Deux-Sèvres near Niort, France into a Huguenot family of lower nobility. Her parents were Alexandre II d'Esmier d'Olbreuse and Jacquette Poussard du Bas-Vandré. She went to the royal court in Paris as a lady-in-waiting in the service of Marie de la Tour d'Auvergne, Duchess of Thouars, whose son had married Emily of Hesse-Kassel, daughter of William V of Hesse-Kassel, in 1648.

In the winter of 1664 Éléonore accompanied the Duchess of Thouars who visited her son in Kassel. There the beautiful Éléonore met the unmarried George William, Duke of Brunswick-Lüneburg, who immediately fell in love with her.

Éléonore became his mistress and received the title Lady of Harburg. In 1666 their only child, Sophie Dorothea, was born. In 1674 the child was legitimised and Éléonore became the Duchess of Wilhelmsburg. Two years later the couple could finally marry. It was a happy marriage.

Their daughter was married in 1682 to George Louis, the son of her father's brother Ernest Augustus, Elector of Hanover for dynastical reasons. The marriage was a disaster. Finally Sophie Dorothea was imprisoned by her husband in the Castle of Ahlden for the rest of her life. During the last years of her life, Éléonore cared for her daughter and tried to obtain her release, without success.

Éléonore d'Esmier d'Olbreuse died 5 February 1722, nearly blind, in Celle Castle, Celle. She mentioned 342 persons in her will. She was buried in the Stadtkirche St. Marien (town church of St. Mary) in Celle.