HM George I's 15-Great Grandfather. Poss. HRE Charles VI's 14-Great Grandfather. U.S. President [MONROE]'s 15-Great Grandfather. PM Churchill's 20-Great Grandfather. Lady Diana's 21-Great Grandfather. PM Cameron's 22-Great Grandfather. Louis XVII's 19-Great Grandfather. `Osawatomie' Brown's 17-Great Grandfather. Jamie's 23-Great Grandfather.