The first Turks to form a state in the territory of Central Asia (including Kyrgyzstan) were Göktürks or Kök-Türks. Known in medieval Chinese sources as Tujue (突厥 tú jué), the Göktürks under the leadership of Bumin/Tuman Khan/Khaghan (d. 552) of Ashina tribe or dynasty and his sons established the first known Turkic state around 552 in the general area of territory that had earlier been occupied by the Xiongnu, and expanded rapidly to rule wide territories in Central Asia. The Göktürks split into two rival Khanates, of which the western one disintegrated in 744 CE.