Mary, Countess of Delorain (1705-1737), three-quarter length, in a white dress by an orange tree, a landscape beyond

The sitter was the daughter of Matthew Lister of Burwell, Lincolnshire. She married firstly Thomas Heardson of Claythorpe before 1732 and, secondly, Francis Scott, 2nd Earl of Delorain (1710-1739), on 29 October 1732. She died on 16 June 1737, the year after she sat to Vanderbank for this portrait, and was buried in Lincoln Cathedral.