Lady Diana's 13-Great Grandmother. HM Juan Carlos' 13-Great Grandmother. Philippe of Belgium's 13-Great Grandmother. Grand Duke Henri's 13-Great Grandmother. HM Margrethe II's 13-Great Grandmother. HM Beatrix's 12-Great Grandmother. HM Carl XVI Gustaf's 13-Great Grandmother. HM Harald V's 12-Great Grandmother. HRH Catharina-Amalia's 14-Great Grandmother.