The Sackville Children, 1796, Oil on canvas, 60 x 49 in. (152. 4 x 124. 5 cm), Paintings, John Hoppner (British, London 1758?1810 London), The children of the third Duke of Dorset were painted in the summer of 1796 at Knole, the Sackville family seat. They are (left to right) : Lady Mary Sackville (1792?1864), later Countess of Plymouth and Countess Amherst; the Duke's only son, Lord Middlesex (1793?1815), later the fourth Duke of Dorset; and Lady Elizabeth Sackville (1795?1870), later Countess De La Warr and Baroness Buckhurst