Since Ashina Shibobi was still a minor, Ilteber shad (Chinese: 俟利弗設; pinyin: sìlìfú shè) succeeded his elder brother as khagan, also creating him Nipu shad and appointing eastern territories to him.
Starting to plan a major assault as advised by Liang Shidu, he became allied to Wang Shichong and Dou Jiande.
As part of the plan, he requested Dou to cross the Taihang Mountains and meet him at Jin (晉州, roughly modern Linfen, Shanxi) and Jiang (絳州, roughly modern Yuncheng, Shanxi) Prefectures.
However he died from illness, possibly poisoned by the Minister of Ceremonies (Chinese: 太常卿; pinyin: tàichángqīng) Zheng Yuanshu (鄭元璹).
[4] He married the Sui dynasty's Princess Yicheng (義成公主) in heqin, the former wife of Qimin in levirate marriage along with other wives.