Claudine Guérin de Tencin
French salonist and author / From Wikipedia, the free encyclopedia
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Claudine Alexandrine Guérin de Tencin, Baroness of Saint-Martin-de-Ré /ɡəˈræn də ˌtɒnˈsæn/ (27 April 1682[1] – 4 December 1749) was a French salonist and author. She was the mother of Jean le Rond d'Alembert, who later became a prominent mathematician, philosophe and contributor to the Encyclopédie, though she left him on the steps of the Saint-Jean-le-Rond de Paris [Wikidata] church a few days after his birth in November 1717.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Madame_de_Tencin.jpg/220px-Madame_de_Tencin.jpg)