Pirro Ligorio ( 1500 - 1583 ) was a painter. Pirro Ligorio s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 22705 USD for Two princes of the House of Guelph: Duke William VII and Duke Philip VI in 2004 to 23084.03 USD for Hercules at the organ in 2015 , based on the size and medium of the artwork.