In the 7th cen tury,the Tubo Kin gdom was founded.Originating from what appears on a map as a giant fan-shaped terrace(the Yarlung River Valley in Chongye County of Lhoka City),the Tubo Kingdom built a royal tomb,commonly known as the"Tombs of Tibetan Kings".One after another,those giant tomb mounds were inserted among the foothills of this valley.