Franz Xaver Wagenschön ( 1726 - 1790 ) was a Czech painter. Franz Xaver Wagenschön s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 850 USD for Beauty and Time--Venus Crowned by Cupid While Time Sleeps in 2004 to 39419.74 USD for Venus attempting to hold back Mars in 2006 , based on the size and medium of the artwork.