François De Troy ( 1645 - 1730 ) was a French painter. François De Troy s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 43020 USD for Portrait of H. Bernard de Roqueleyne, the Baron de Longepierre in a red coat and white cravatte, holding a book in his left hand in 2003 to 230500 USD for THE ASTRONOMY LESSON OF THE DUCHESSE DU M