Poss. Lady Diana's 14-Great Uncle. HM Juan Carlos' 14-Great Uncle. Philippe of Belgium's 14-Great Uncle. Grand Duke Henri's 14-Great Uncle. HM Margrethe II's 14-Great Uncle. HM Beatrix's 13-Great Grandfather. Wm. von Bismarck's 10-Great Grandfather. `Red Baron' Richthofen's 11-Great Uncle.