How did Jules' rebellion happen?

The uprising launched by the ruling clique in the late Northern Wei Dynasty for the central government. Also known as "the change of river shade". The Jules family belongs to the Red Fox, originally a tribe of Huns. In the early years of the Northern Wei Dynasty, it was subordinate to the Tuoba Department of Xianbei and set up Xiurongchuan (now North of Shuoxian County, Shanxi Province). This area is suitable for grazing. Jules is the chief and has accumulated a lot of wealth. In the late Northern Wei Dynasty, Er Zhurong (? ~ 530) is the chief of the Red Tiger. There are more than 8,000 tribesmen, cattle, sheep and camels with different colors, which pervade the valley. After the people's uprising broke out at the end of Wei Dynasty, Er Zhurong colluded with the local forces of Han nationality and actively developed political and military forces. The people's uprising in Xiurong area has been suppressed successively, and the military situation is growing day by day.

In February (528) of the first year of Wutai in Ming Di, Xiao Wei, Hu Taihou poisoned Xu Yuan, the emperor of Xiaoming, pretending to be the emperor, and a three-year-old Yuan Zhao was established a few days later. Riding general, He, boss, Fen, Tang, Heng and Yun, the governor of six states, won Er Zhu Rong, and led the troops from Bing to Luoyang on the pretext of revenge for Emperor Xiaoming. On April 11th, Er Zhurong established Yuan Ziyou as emperor (Emperor Xiao Zhuang) in Yin He (now northeast of Luoyang, Henan Province) as his assistant, in charge of various military orders, generals, ministerial orders and leading generals at home and abroad. On the same day, the garrison commander of the northeast portal river bridge in Luoyang surrendered to Er Zhurong, leaving the capital unguarded. The soldiers were scattered, and Hu Taihou was forced to cut Niebuhr's hair. 12, the royal family and aristocratic bureaucrats greeted them in He Qiao. 13, Er Zhurong first sent people to drown Hu Taihou and Yuan Zhao in the river shade, and in the name of offering sacrifices to heaven, he gathered all the officials who greeted him, claiming that there was chaos in the world, and Emperor Xiaoming was killed, which was completely caused by the greed, cruelty and neglect of rescue of detained officials. Therefore, soldiers killed more than 2,000 princes and nobles for the famous Yin He Massacre in history. Er Zhurong carried Yuan Zi, the emperor of Xiao Zhuang, into Luoyang, where he exercised autocratic rule.

Yuan Ziyou, the emperor of Xiao Zhuang, witnessed the tragic scene of the Yin He Massacre, knew Er Zhurong's political ambition and had a premonition of his own danger. After some conspiracy, he killed Er Zhurong in September of the third year of Yong 'an (530). Er Zhurong's nephew, Er Zhao Zhu, led cavalry from Fenzhou (now Fenyang, Shanxi) into Luoyang, killed Emperor Xiao Zhuang, made Yuan Gong Emperor (Jiemin Emperor), and Er Zhi Zhu continued to control the north.