Franz Theodor Aerni ( 1853 - 1918 ) was a German painter. Franz Theodor Aerni s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 477.18 USD for AN ITALIAN LANDSCAPE. in 2011 to 9200 USD for THE GIZA PLATEAU. in 2012 , based on the size and medium of the artwork.