Johann Heiss ( 1640 - 1704 ) was a German painter. Johann Heiss s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 6338.03 USD for THE TRIUMPH OF NEPTUNE AND AMPHITRITE in 2003 to 206500 USD for VULCAN SURPRISING VENUS AND MARS IN BED BEFORE AN ASSEMBLY OF THE GODS in 2013 , based on the size and medium of the artwork.