Jacques Vaillant (after) ( 1625 - 1691 ) was a Flemish painter. Jacques Vaillant (after) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 5570.44 USD for PORTRAIT OF THE ELECTOR ERNST AUGUST OF HANOVER(1629-1698) in 2005 to 6076.84 USD for PORTRAIT OF THE ELECTRESS SOPHIA OF HANOVER (1630-1714), LATER WIFE OF ERNST AUGUST, ELECTO