HRH Charles's 9-Great Grandfather. Louis XVII's 6-Great Uncle. HM Juan Carlos' 11-Great Uncle. Philippe of Belgium's 10-Great Grandfather. HM Manuel II's 10-Great Uncle. Grand Duke Henri's 10-Great Grandfather. HM Margrethe II's 9-Great Grandfather. HM Beatrix's 10-Great Grandfather. HM Constantine II's 9-Great Grandfather. HM Carl XVI Gustaf's 9-Great Grandfather. HM Harald V's 9-Great Grandfather. HM Umberto II's 11-Great Uncle.