Poss. Lady Diana's 14-Great Uncle. Philippe of Belgium's 16-Great Uncle. Grand Duke Henri's 15-Great Uncle. HM Beatrix's 12-Great Grandfather. HM Constantine II's 15-Great Uncle. HM Carl XVI Gustaf's 15-Great Uncle. Wm. von Bismarck's 10-Great Grandfather. `Red Baron' Richthofen's 10-Great Grandfather.