HRH Charles's 17-Great Uncle. Philippe of Belgium's 18-Great Uncle. Grand Duke Henri's 18-Great Uncle. HM Margrethe II's 17-Great Uncle. HM Beatrix's 18-Great Uncle. HM Constantine II's 16-Great Grandfather. HM Carl XVI Gustaf's 16-Great Grandfather. Wm. von Bismarck's 12-Great Uncle. `Red Baron' Richthofen's 14-Great Grandfather.