Poss. Lady Diana's 13-Great Aunt. Philippe of Belgium's 14-Great Grandmother. Grand Duke Henri's 13-Great Grandmother. HM Beatrix's 12-Great Grandmother. HM Constantine II's 13-Great Grandmother. HM Carl XVI Gustaf's 13-Great Grandmother. Wm. von Bismarck's 9-Great Aunt. `Red Baron' Richthofen's 12-Great Grandmother.