Pierre Louis Delaval ( 1790 - ) is a French painter. Pierre Louis Delaval s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 800 USD for Portrait of a Woman in 2006 to 2366.86 USD for POLYCARPE, VICOMTE DE LA ROCHEFOUCAULD, DUC DE DOUDEAUVILLE, MINISTRE DE LA MAISON DU ROI in 2008 , based on the size and medium of the artwork.