Isfijab (Sayram in modern Kazakhstan). They further laid a siege on Istijab . But although Yukuk got no help from Tulo tribes he managed to defeat them. After this victory, Yukuk tried to regain Tulo support. But Tulo leaders rejected his proposal. Yukuk, feeling insecure without tribal support, escaped to Kunduz (in modern Afghanistan) in 642. He then conquered Tuhuoluo (吐火羅; i.e. Bactrian-speaking Tokharoi or Tocharians) and attacked Yiwu in 642, which had by now been converted into Tang's Yi Prefecture (伊州), although his attacks were repelled by the Tang general Guo Xiaoke (郭孝恪). In 642, he began to suffer dissent within, as he was said to have hoarded the spoils from attacks on the Sogdian states of Kangju (康居) and Maymurgh (米 Mǐ; on the Amu Darya near today Panjakent) and refused to divide them with his subordinates, and when one of his generals, Ashina Nishou (阿史那泥熟) nevertheless seized some, Ashina Yugu executed him, causing Ashina Nishou's subordinate Huluwu (胡祿屋) to rebel. The rebels sought aid from Tang, and Emperor Taizong created El Kulug Shad's son as Irbis Sheguy khagan. Yukuk initially prevailed in battle against Yipishekui Khan, but the rebels refused to submit despite the defeats, and Yukuk eventually withdrew and took up position in former Tuhuoluo territory. Later years New khagan initially attacked Yukuk and forced him to escape to Isfijab (Sayram in modern Kazakhstan). They further laid a siege on Isfijab . But although Yukuk got no help from Tulu tribes he managed to defeat them. After this victory, Yukuk tried to regain Tulu support. But Tulo leaders rejected his proposal. Yukuk, feeling insecure without tribal support, escaped to Kunduz (in modern Afghanistan) in 642. He spent the rest of his life in Kunduz and died in 653. His heir was Zhenzhu Yabgu, who was one of the last representatives of the family. But his authority was limited to a single city. References 653 deaths Göktürk khagans Ashina house of the Turkic Empire 7th-century Turkic people Year of birth unknown