Kumo Xi
In 691 Ilterish Qaghan died and was succeeded by his younger brother, who assumed the title Qapaghan Qaghan. In 696–697 Qapaghan subjugated the Khitans and sealed an alliance with the Kumo Xi (Tatabï in Turkic texts), which stemmed the advance of the Chinese armies to the northeast, into the foothills of the Khingan, and secured the empire's eastern frontier. Between 698 and 701 the northern and western frontiers of Qapaghan's state were defined by the Tannu Ola, Altai and Tarbagatai mountain ranges. After defeating the Bayirku tribe in 706–707, the Türks occupied lands extending from the upper reaches of the Kerulen to Lake Baikal. In 709–710