Poss. HM George I's 9-Great Grandfather. U.S. President [MONROE]'s 13-Great Grandfather. HRH Charles's 17-Great Grandfather. PM Churchill's 16-Great Grandfather. Lady Diana's 16-Great Grandfather. PM Cameron's 18-Great Grandfather. HRH Albert II's 18-Great Grandfather. Poss. Jamie's 15-Great Grandfather.