柔然
The Rouran Khaganate, also Juan-Juan Khaganate (), was a tribal confederation and later state founded by a people of Proto-Mongolic Donghu origin. The Rouran supreme rulers are noted for being the first to use the title of "khagan", having borrowed this popular title from the Xianbei. The Rouran Khaganate lasted from the late 4th century until the middle 6th century, when they were defeated by a Göktürk rebellion which subsequently led to the rise of the Turks in world history.