Poss. HRH Charles's 9-Great Grandmother. Poss. Philippe of Belgium's 10-Great Grandmother. Poss. Grand Duke Henri's 10-Great Grandmother. Poss. HM Margrethe II's 9-Great Grandmother. Poss. HM Constantine II's 9-Great Grandmother. Poss. HM Carl XVI Gustaf's 9-Great Grandmother. Poss. HM Harald V's 9-Great Grandmother.