Louis XVII's 10-Great Grandmother. HM Juan Carlos' 15-Great Grandmother. Philippe of Belgium's 14-Great Grandmother. HM Manuel II's 14-Great Grandmother. Grand Duke Henri's 14-Great Grandmother. HM Margrethe II's 15-Great Grandmother. HM Carl XVI Gustaf's 15-Great Grandmother. HM Harald V's 14-Great Grandmother. HM Umberto II's 13-Great Grandmother.