Sir Thomas Lawrence’s full length portrait of Anne, Viscountess Pollington (later Countess of Mexborough) with her son John Charles (later 4th Earl of Mexborough) is on display at Moretti Fine Art, Duke St., St. James’s, as part of London Art Week. Lawrence was the leading British portrait painter of the early 19th century and Anne was the eldest daughter of the politician Philip Yorke, 3rd Earl of Hardwicke (1757-1834) who was Lord Lieutenant of Ireland in 1801. He served as the first Viceroy in Post-Union Ireland. The Earl of Mexborough remains a title in the peerage of Ireland. London Art Week is in full swing in various galleries around central London until July 7.