HM Juan Carlos' 8-Great Grandmother. Philippe of Belgium's 8-Great Grandmother. Grand Duke Henri's 8-Great Grandmother. HM Margrethe II's 7-Great Grandmother. HM Beatrix's 7-Great Grandmother. HM Constantine II's 8-Great Grandmother. HM Carl XVI Gustaf's 8-Great Grandmother. HM Harald V's 7-Great Grandmother.