Thought to be lady charlotte mcdonnell, 3rd countess of antrim (1779-1835). Object Type: painting. Date: 1790s. Dimensions: height: 126.5 cm (49.8 in); width: 101 cm (39.7 in). Medium: oil on canvas. Collection: Unidentified location. Hugh Douglas Hamilton - Portrait of a Lady (probably Lady Charlotte McDonnell, 3rd Countess of Antrim in 1790s)