Yenisei-centered Turkic khaganate that briefly dominated the eastern steppe after destroying the Uyghur Khaganate in 840.
Steppe hegemony ended c.924 CE when Khitan (Liao) forces under Abaoji pushed the Kyrgyz back to the Yenisei; the khaganate persisted in its Siberian homeland until absorbed into the Mongol Empire in 1207 CE.
The atlas holds 4 border frames for Kyrgyz Khaganate — the shape you scrub through changes in 693 · 744 · 840 · 851.
Broad survey covering the Yenisei Kyrgyz and steppe powers of the period; Rutgers University Press, confirmed via Cambridge Core and Rutgers UP catalogue.