Carl Hartmann ( 1818 - 1857 ) was a German painter. Carl Hartmann s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 274.08 USD for Juliana Princess of Thurn and Taxis (1806-1846) with her daughter Sophie (1835-1913) in 2003 to 4070.28 USD for Christ nacht (Christmas Eve) in 2008 , based on the size and medium of the artwork.