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