James Thornhill ( 1675 - 1734 ) was a British painter. James Thornhill s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 4589.18 USD for THE TRIUMPH OF NEPTUNE AND AMPHITRITE in 2003 to 25004.11 USD for Proposed design for the saloon ceiling at Blenheim Palace, Oxfordshire: The Apotheosis of Hercules in 2005 , based on the size a