HM George I's 21-Great Grandfather. HRE Ferdinand I's 18-Great Grandfather. U.S. President [B, HARRISON]'s 27-Great Grandfather. HM Margrethe II's 28-Great Grandfather. Wm. von Bismarck's 26-Great Grandfather. Poss. Agnes Harris's 21-Great Grandfather. `Osawatomie' Brown's 36-Great Grandfather.