David Allan ( 1744 - 1796 ) was a British painter. David Allan s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 9259.26 USD for PORTRAIT OF TWO BOYS in 2003 to 82452.09 USD for PORTRAIT OF SIR WILLIAM AND LADY HAMILTON in 2006 , based on the size and medium of the artwork.