The children of the third Duke of Dorset were painted at Knole, the Sackville family seat. They are (left to right): Lady Mary Sackville (1792–1864); the Duke's only son, Lord Middlesex (1793–1815), later fourth Duke of Dorset; and Lady Elizabeth Sackville (1795–1870). The picture was exhibited in 1797 under the title "Portraits of a nobleman's children." The pose of the boy derives from a famous portrait of Henry VIII by Hans Holbein.
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