Poss. Louis XVII's 8-Great Grandmother. Poss. HM Juan Carlos' 13-Great Grandmother. Philippe of Belgium's 11-Great Grandmother. Poss. HM Manuel II's 12-Great Grandmother. Grand Duke Henri's 11-Great Grandmother. HM Margrethe II's 12-Great Grandmother. HM Carl XVI Gustaf's 12-Great Grandmother. HM Harald V's 11-Great Grandmother. HM Umberto II's 10-Great Grandmother.