Ili river treaty

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Ili river gave a name to Ili river treaty of 638 CE, which formalized a division of the Turkic Kaganate (552-638 CE) into Eastern (Göktürks) and Western Turkic Kaganates, with the border between two states fixed along the Ili river. The splinter resolved a conflict started with re-districting of 634 CE, which re-distributed the Kaganate lands between constituent tribes, with a strong bias on favor of the eastern tribes. A leading role in the conflict and ensuing war played Ezgil leader Kül-erkin, who initiated and participated in summoning the most important officials of the state to a kurultai to demote Terish and to raise Yukuk-shad as a Supreme Kagan. After the treaty, the head of the Turkic Kaganate Terish-kagan (634-638) retained control of the eastern part of the Kaganate, and the western part was headed by Yukuk-shad of the royal Ashina clan, who became a Kagan of the "western surnames", with a throne name Yelbi-Turuk-Kagan. ^[1]