François Tesson and Paul Loise traveled with Delaunay on this trip. Tesson was a St. Louisan from a French family. Paul Loise had been appointed by Meriwether Lewis as translator for the Osage in 1808. Sources disagree about Loise’s parentage. [McMillen, “Les Indiens Osages: French Publicity for the Traveling Osage,” MHR, p. 297.]