HRH Charles's 15-Great Aunt. Philippe of Belgium's 16-Great Aunt. Grand Duke Henri's 16-Great Aunt. HM Margrethe II's 15-Great Aunt. HM Constantine II's 15-Great Aunt. HM Carl XVI Gustaf's 15-Great Aunt. HM Harald V's 15-Great Aunt. Wm. von Bismarck's 9-Great Grandmother. `Red Baron' Richthofen's 11-Great Grandmother. HRH Catharina-Amalia's 13-Great Grandmother.