He was a chor serving under Suoge before Battle of Bolchu. After Suoge's defeat, Türgesh migrated to south of Zhetysu valley. During Qapaghan Qaghan's death and Kul Tegin's coup they used the opportunity to reassert independence and chose Suluk, a Black Türgesh chieftain to be their supreme leader in 715 or 716. However as in Suoge's case, he was not acknowledged as a khagan by Tang. Ashina Xian was appointed "Shixing Qaghan" and Suluk was created his subordinate general with titles "Great General of the Left Wing of the Forestial Army" and "Grand Military Commissioner of Jinfang" by Xuanzong. However, this caused a rift between two and soon Suluk defeated Xian on June and July in 717, besieged Aksu and Uch Turfan. He declared himself as khagan during August or September. Xuanzong had to accept Suluk's independence and created him Duke of Shunguo in 718 and Zhongshun Khagan in 719.
Struggle against Umayyads
With his eastern flank secured, beginning by 721, Suluk fought against the Arab armies for ten years. Backed by other local powers against the invading Umayyads, his operations were generally hit and run operations and his manoeuvres were aimed at the depriving the invading army of water. His army was much smaller than that of Arabs. But unlike Arabs, they were at home in the deserts of the area. His success in the deserts gained him fame. Many times the Arab army had to withdraw to find fresh water the. He was known by Arabs as Abū Muzāhim.
Later reign
He had a conflict with Du Xian in 726. When Princess Jiaohe sent messengers and 1,000 horses to Du's headquarters to sell horses, the messengers read of an order from her, as princess—and Du responded by angrily stating, "How dare an Ashina woman issue me an order?" He caned the messengers and detained the horses, which largely died in a few subsequent snowstorms. In late 726, after Du left his office, Suluk attacked Tarim Basin, causing much damage, and Suluk withdrew only after he heard that Du had been made chancellor. He attacked Beshbaliq unsuccessfully 27 October 735, however was heavily crushed by Tang armies. He was forced to send his envoy Ulu Tarkhan to make peace. This was a serious blow to his prestige. Another defeat at Battle of Kharistan in 737 sealed Suluk's fate. He was killed in 737 or 738 by Baga Tarkhan, one of his relatives.
Aftermath
The death of Suluk caused a civil war, which divided the Türgesh into two rival factions: the Yellow Türgesh who supported Baga Tarkhan and Black Türgesh who supported Kut Chor. Bilge Khagan, the last of the able Turkic khagans, was already dead and with the death of Suluk, Transoxiana was opened to Arabic conquest. Around this time there was a power shift in the Caliphate, as the Umayyad dynasty was supplanted by the Abbasid dynasty. The policy of the Abbasid Caliphs was more peaceful than that of the Umayyads and Arab control of Transoxiana was limited to the occupation of a few forts.
Family
He had three wives:
Princess Jiaohe - m. 722, Ashina Huaidao's daughter
