A key for Mr. Copley's plate of the Death of the late Earl of Chatham [graphic].[26 December 1791]engKey plate to the print of the Death of the Earl of Chatham, in the Upper Chamber of the Palace of Westminster, 1778, with 55 members identifiedTitle engraved at top of image.John Singleton Copley's oil painting on which the engraving was based, was first exhibited at the Royal Academy in 1780 and is now held at the Tate Gallery, London.