Hon. Elizabeth Poyntz, (née Browne), by Sir William John Newton (1785-1869).

Rectangular, in a heavy Miers-type ormolu frame, 10.4cm. Circa 1815.
Elizabeth Poyntz (d.1830), was the wife of William Stephen Poyntz of Cowdray and the sister and heiress of George, 8th Viscount Montagu. She was the mother of Isabella (1803-1879), who in 1824 became the wife of Brownlow, 2nd Marquess of Exeter (1795-1867). Isabella inherited many fine works of art which became part of the collections at Burghley.
The artist was one of the most fashionable miniaturists of the early 19th Century and was appointed miniature painter to Queen Victoria on her accession in 1837.