The Last Meeting of Lee and Jackson at Chancellorsville
The Last Meeting of Lee and Jackson at Chancellorsville was a painting depicting American Civil War Confederate Generals Robert E. Lee and Stonewall Jackson during their final meeting in 1863. 

An image depicting this painting was scanned by the Talosians as they reviewed the library computer files on board  in 2254. ()

Appendices

Background information
Although not mentioned by name in dialogue, the painting, appeared on a viewscreen of the library computer in the original 1964/65 version of the episode. This painting was created by painter Everett B.D.F. Julio in 1869, and currently resides in the Museum of the Confederacy, located in Richmond, Virginia. 

While left out of the retconned 2009 remastered episode version, Memory Alpha still considers the image as a valid reference source.

fr:The Last Meeting of Lee and Jackson at Chancellorsville

Earth visual art (retconned)