Born in 1768, Etienne-Marie-Antoine Champion Nansouty was a brilliant horseman and like Napoleon, attended military school in Brienne and Paris. He served in the Ancien Régime army but did not leave France following the Revolution and went on to serve in the Armée du Rhin, becoming a général de brigade in August 1799. Serving under Murat in the cavalry reserves of the Grande Armée, he distinguished himself at Ulm, Austerlitz, Eylau and Friedland. He was made Premier Ecuyer to the Emperor, grand aigle of the Légion d'honneur and Comte de l'Empire before following Napoleon on the Austrian Campaign of 1809. There he participated in the battles at Eckmühl, Essling and Wagram. He was present during the Russian campaign in 1812, but received a bullet to the knee whilst participating in a charge at the Battle of Borodino (7 September, 1812). In 1813, he reappeared at Leipzig and Hanau, where he was once again wounded. Further injuries occurred during the French Campaign in 1814. He was active during the Restoration and became the aide-de-camp to the Comte d'Artois. He died in Paris on 12 February 1815.
Source: Dictionnaire Napoléon (tr. & ed., with permission, H.D.W.)