Western Turkic Khaganate
It collapsed in 603, after a series of conflicts and civil wars which separated the polity into the Eastern Turkic Khaganate and Western Turkic Khaganate. The Tang Empire conquered the Eastern Turkic Khaganate in 630 and the Western Turkic Khaganate in 657 in a series of military campaigns. The Second Turkic Khaganate emerged in 682 and lasted until 744 when it was overthrown by the Uyghur Khaganate.