A mezzotint engraved by George Every and published in 1866, after a portrait of Lady Diana Beauclerk (as she became) by Sir Joshua Reynolds..
Reynolds painted Lady Diana during her marriage to Frederick St.John, 2nd Viscount Bolingbroke prior to the couple's divorce in 1768.
The original painting hangs at Kenwood House, London and a copy by George Perfect Harding after John Powell and Sir Joshua Reynolds can be seen in Lydiard House.