HRH Charles's 10-Great Uncle. Louis XVII's 5-Great Grandfather. HM Juan Carlos' 10-Great Grandfather. Philippe of Belgium's 11-Great Grandfather. HM Manuel II's 9-Great Grandfather. Grand Duke Henri's 10-Great Grandfather. HM Margrethe II's 10-Great Uncle. HM Beatrix's 11-Great Uncle. HM Constantine II's 10-Great Uncle. HM Carl XVI Gustaf's 10-Great Uncle. HM Harald V's 10-Great Uncle. HM Umberto II's 10-Great Grandfather.