George Catlin painted this small portrait of Henry Leavenworth in 1834 at Fort Gibson in Indian territory, near present Tulsa. Catlin painted it only a few weeks before Leavenworth's death on an expedition to the Comanche and Pawnee Pict in Cross Timbers country (Oklahoma). Catlin was a 19th century American painter, author and traveler. He was known for specializing in portraits of Native Americans. Catlin rarely painted white men, which makes this portrait of Leavenworth unique. The painting is currently on display at the museum.
For more on the life of George Catlin visit: https://www.georgecatlin.org/biography.html
For more information about the Leavenworth portrait: https://www.kshs.org/p/kansas-historical-quarterly-the-catlin-portrait-of-general-leavenworth/17436