Langlois won the second prize at the
Prix de Rome in 1805 and the first prize in 1809, moving to Rome in the 1810s. A preparatory drawing of the painting that granted him the first place (''Priam aux pieds d'Achilles'') is in the collection of the
Musee Magnin in Dijon, France. Since 1806 he regularly exhibited at the
Salon until 1837, winning the second prize in 1817 and first prize in 1819. Langlois's
Diana and Endymion of 1822 was commissioned by
Louis XVIII for his Salon of Diane at the
Palace of Versailles. It was displayed at the
Musée de Picardie from 1878 and has been missing since
World War I. It may be in the
private collection of the American performer
Madonna. In 1824 he was in Brussels, where he painted the portrait of Jacques-Louis David, which was exhibited in 1831. ==Honors==