HRH Charles's 15-Great Uncle. Philippe of Belgium's 16-Great Uncle. Grand Duke Henri's 16-Great Uncle. HM Margrethe II's 15-Great Uncle. HM Constantine II's 15-Great Uncle. HM Carl XVI Gustaf's 15-Great Uncle. HM Harald V's 15-Great Uncle. Wm. von Bismarck's 9-Great Grandfather. `Red Baron' Richthofen's 12-Great Grandfather. HRH Catharina-Amalia's 13-Great Grandfather.