Jules Guerin ( 1866 - 1946 ) was an American painter. Jules Guerin s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 600 USD for View of St. Marks Square from the Grand Canal in 2004 to 12650 USD for TWO WORKS: “THE MARKET PLACE SIENA” AND “THE PORTA ROMAN SIENA” in 2006 , based on the size and medium of the artwork.