HM George I's 23-Great Grandmother. Poss. HRE Ferdinand I's 21-Great Grandmother. HRE Charles VI's 28-Great Grandmother. U.S. President [HAYES]'s 23-Great Grandmother. Lady Diana's 27-Great Grandmother. Poss. Agnes Harris's 23-Great Grandmother. `Osawatomie' Brown's 30-Great Grandmother.