William Pether ( 1738 - 1821 ) was a British painter. William Pether s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 1474.28 USD for 'A Philosopher giving a lecture on the Orrery' in 2005 to 21600 USD for Three Persons Viewing the Gladiator by Candlelight. in 2010 , based on the size and medium of the artwork.