Victoria Hepburn discusses the recent identification of Marcus Richard Fitzroy Thomas as the previously unnamed boy in Reynolds’s portrait of Charles Stanhope, third Earl of Harrington. The Yale Center for British Art’s retitling of the painting marks the first time in its 240-year exhibition history that both sitters are named. This talk outlines current research into the life of Marcus Richard Fitzroy Thomas and explores how this new knowledge may bear upon an interpretation of the work.