Charles John Gardiner, 1st Earl of Blessington (1782 – 25 May 1829) was an Irish earl best known for his marriage to Margaret Farmer, née Power, whom he married at St Mary's, Bryanston Square, London, on 16 February 1818 (only four months after her first husband's death). He was elected a representative peer in 1809, created Earl of Blessington in 1816, and inherited the title of Viscount Mountjoy in 1798. He was present at the trial of Queen Caroline.[1]