HRH Charles's 8-Great Grandfather. Philippe of Belgium's 9-Great Grandfather. Grand Duke Henri's 9-Great Grandfather. HM Margrethe II's 8-Great Grandfather. HM Beatrix's 8-Great Grandfather. HM Constantine II's 8-Great Grandfather. HM Carl XVI Gustaf's 8-Great Grandfather. HM Harald V's 8-Great Grandfather.