Cornelis Ketel ( 1548 - 1616 ) was a Dutch painter. Cornelis Ketel s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 536.96 USD for Portrait of a gentleman, head study, wearing a ruff in 2004 to 10738.17 USD for PORTRAIT OF THOMAS CECIL, 1ST EARL OF EXETER (1542-1622/3) in 2011 , based on the size and medium of the artwork.