John St John, 12th Baron St John of Bletso English Baron (1725–1767) Parents John St John, 11th Baron St John of Bletso Elizabeth St John Children Elizabeth Barbara St. John John Peter St. John Anne St. John Mathilda St. John Henry St John, 13th Baron St John of Bletso George St. John St Andrew St John, 14th Baron St John of Bletso Siblings Barbara Coventry, Countess of Coventry Ambrose St. John St Andrew St John Henry St. John Partners Susanne Louise Simond