Marcellus Laroon (after) ( 1679 - 1772 ) was a British painter. Marcellus Laroon (after) s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 569.05 USD for JOHN KNOX DELIVERING A SERMON in 2006 to 3750 USD for Portrait of a family around a harpsichord in 2011 , based on the size and medium of the artwork.