|Musa Baytash Khan|
|Khagan of Karakhanids|
|Predecessor||Sultan Satuq Bughra Khan|
|Successor||Suleyman Arslan Khan|
|Father||Sultan Satuq Bughra Khan|
Musa Baytash Khan was the fifth head of the Karakhanid state and the second Muslim khan to rule. His name is often mentioned as Tonga Illig, Arslan Khan (in Tazkirah Bughra Khan). His brother was the lesser khan with western parts of the country assigned as his appanage.
His reign saw raids against Qocho and Khotan. He developed water conservancy and transportation near Kashgar and founded a school and a library. Ibn ul-Athir reported that, in 960, during his reign, 200,000 Turkic people embraced Islam. Samanid proselytizers Abul Hasan Said b. Hatim and Abuzar Ammar at-Tamimi were instrumental in this regard. Musa Baytash temporarily lost Kashgar to the King of Khotan, Visa Sura (?) when latter attacked the Karakhanid state in 971, achieving a big victory. In addition to women and children, there were elephants among the spoils, which were sent to Song China as tribute. It is unknown when his reign came to an end.