HM George I's 20-Great Grandmother. Poss. HRE Ferdinand I's 16-Great Grandmother. HRE Charles VI's 21-Great Grandmother. U.S. President [MONROE]'s 28-Great Grandmother. HM Margrethe II's 27-Great Grandmother. Wm. von Bismarck's 26-Great Grandmother. Poss. `Osawatomie' Brown's 26-Great Grandmother.