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Jacques Hardouin-Mansart de Sagonne (26 July 1711, Paris - 27 September 1778, Paris) was a French architect. He was the illegitimate son of Jacques Hardouin-Mansart, comte de Sagonne, by his mistress Madeleine Duguesny - Jacques and Madeleine married in 1726. Jacques junior's elder brother was the architect Jean Mansart de Jouy (1705-1783), whilst he was also the grandson of Jules Hardouin-Mansart, great-great-great nephew of François Mansart and great-nephew of Robert de Cotte.
