突厥汗国
The Göktürks, a Turkic people formerly subject to the Rouran, migrated westward, pushing the remnants of the Huns west and southward. By the mid-6th Century, the Central Eurasian steppes had become controlled by the First Turkic Khaganate, also known as the Göktürk Khaganate. A few decades later, a civil war resulted in the khaganate being split, and establishment of the Western Turkic Khaganate, under the Onogur tribes and Eastern Turkic Khaganate (under the Göktürks). In 659, the Western Turkic Khaganate was ended by the Tang Empire. Towards the end of the 7th Century, the two states were reunited in the Second Turkic Khaganate. However, the khaganate began to fragment only a few generations later.