Gavin Hamilton ( 1723 - 1798 ) was a British painter. Gavin Hamilton s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 27652.8 USD for Group portrait of the Porten family taking tea in a lavish interior, with a red velvet curtain in the foreground and a garden se in 2005 to 163256.05 USD for ORTRAIT OF EMMA HAMILTON AS A SIBYL in