HRH Charles's 11-Great Grandmother. Louis XVII's 7-Great Grandmother. HM Juan Carlos' 12-Great Grandmother. Philippe of Belgium's 12-Great Grandmother. HM Manuel II's 11-Great Grandmother. Grand Duke Henri's 12-Great Grandmother. HM Margrethe II's 11-Great Grandmother. HM Beatrix's 12-Great Grandmother. HM Constantine II's 11-Great Grandmother. HM Carl XVI Gustaf's 11-Great Grandmother. HM Harald V's 11-Great Grandmother. HM Umberto II's 12-Great Grandmother.