Ilterish Khaghan was the founder of the Second Turkic Khaganate. He was a chieftain of Tujue in 650 inside Chanyu territory. His father and grandfather served as tuduns.
Reign
After defeat of Ashina Funian, he left for the Mongolian steppe, from where he raised an army of 17 generals and 5,000 men. He started with an attack on Huige in 681. He reconquered most of the lands of the first Eastern Turkic Khaganate, founding the Second Turkic Khaganate. In 682 Xue Rengui was commissioned to attack Ashide Yuanzhen, now an aide of Ilterish. His presence intimidated Tujue soldiers, who had thought that he was long dead, and he scored a major victory over Ashide Yuanzhen. Nevertheless in 683, qaghan attacked Wei Prefecture and killed its prefect Li Sijian. When Tang Xiujing's superior, Cui Zhibian the commandant at Feng Prefecture, tried to intercept qaghan at Mount Zhaona, he was defeated and captured. In response, Emperor Gaozong considered withdrawing from Feng Prefecture and moving its residents to Ling and Xia Prefectures. By 683, Wang Benli was serving as the commandant at Sheng Prefecture, khagan attacked the nearby Chanyu Protector General headquarters, capturing and killing the official Zhang Xingshi. Emperor Gaozong sent Wang, along with Li Chongyi, the commandant at Xia Prefecture, to defend against Tujue attack, but historical accounts did not indicate what the results were. In 687, another invasion of Tang by khagan and Ashide Yuanzhen began. Empress Dowager Wu commissioned the ethnically Baekje general Heichi Changzhi, assisted by Li Duozuo, to defend against Tujue attack and they were able to defeat Tujue forces at Huanghuadui, causing Tujue forces to flee. In general, during his reign raids were frequent, reaching almost 40 invasions by Tujue, 20 of them were personally commanded by khagan himself. He appointed brothers Ashina Mochuo and Ashina Duoxifu as shads and yabgus. He was succeeded by his brother, Qapaghan Qaghan, because his son Bögü was too young.
Family
Ilterish Qaghan was the head of the Ashina and distantly related to the Khagans of the first Göktürk Khaganate. His brothers were Ashina Mochuo and Ashina Duoxifu.
Ilterish is mentioned also in 10 to 12 lines of the Kultegin inscription as follows: ...Then Turk Tengri above, Turkish holy Earth and Water said as follows: "In order to Turkish people would not go to ruin and in order to should be a nation again", They rose my father Ilterish Kagan and my mother Ilbilga Katun, to the top and sat them upwards on the throne. My father, the kagan gathered together seventeen brave Lords... Tengri gave them power. My father's army was like wolves, their enemies were like sheep..."
