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Jacques Duphly (also Dufly, Du Phly; January 12, 1715 – July 15, 1789) was a French harpsichordist and composer.

He was born in Rouen, France, the son of Jacques-Agathe Duphly and Marie-Louise Boivin. As a boy, he studied the harpsichord and organ, and was employed as organist at the cathedral in Évreux. He obtained his first position at the cathedral of St. Eloi at the age of nineteen. In 1740 he added a second position at the church of Notre Dame de la Ronde, which he maintained with the help of his sister Marie-Anne-Agathe, who substituted for him. His teachers were François d`Agincourt and Jean-Jacques Rousseau. Later, Rousseau would ask him to contribute to his dictionary, for articles relating to the art of playing the harpsichord.

http://en.wikipedia.org/wiki/Jacques_Duphly