However, they were unhappy about his growing power, which forced Shelun to quickly gather his supporters and capture the sons of Pihouba.
Shelun was afraid of the revenge of the empire and migrated north through the Gobi, uniting nomadic tribes on his way.
Shelun led retaliatory raids against Northern Wei, but suffered a serious defeat in 399 and was forced to flee westward.
Shelun died from his wounds in May 410 and was succeeded by his brother Yujiulü Hulü, because his sons Duba (度拔) and Sheba (社拔) were still young.
[8] He revolutionized the military and public organisation of Rouran (for example, introducing compulsory military recruitment and establishing strict rules of behavior for the warriors, and punishment for those who broke them),[8] introduced the so-called decimal system, overwhelmed and united many Mongolian and Turkic tribes, broke all Rouran's vassalages, and was the first to take the title of khagan.