Erzhu Rong (爾朱榮) (493 – November 1, 530), courtesy name Tianbao (天寶), formally Prince Wu of Jin (晉武王), was a general of the Chinese/Xianbei dynasty Northern Wei. He was of Xiongnu ancestry, and after Emperor Xiaoming was killed by his mother Empress Dowager Hu in 528, Erzhu overthrew her and put Emperor Xiaozhuang on the throne, but at the same time slaughtered many imperial officials and took over most of actual power either directly or through associates. He then contributed much to the rebuilding of the Northern Wei state, which had been rendered fractured by agrarian rebellions during Emperor Xiaoming's reign. However, in 530, Emperor Xiaozhuang, believing that Erzhu would eventually usurp the throne, tricked Erzhu into the palace and ambushed him. Subsequently, however, Erzhu's clan members, led by his cousin Erzhu Shilong and nephew Erzhu Zhao, defeated and killed Emperor Xiaozhuang. He was often compared by historians to the Han Dynasty general Dong Zhuo, for his ferocity in battle and for his violence and lack of tact.
Erzhu Rong's ancestors were hereditary chiefs of the Qihu (契胡) tribe of Xiongnu extraction, and they used Erzhu as their family name after settling on Erzhu River. Erzhu Rong's great-great-grandfather Erzhu Yujian (爾朱羽健) had assisted Northern Wei's founding emperor Emperor Daowu in his campaigns, and therefore was granted the Xiurong (秀容, in modern Shuozhou, Shanxi) region as the Erzhus' hereditary domain. There, the Erzhus practiced husbandry and became extremely wealthy from the accumulation of livestock.
Erzhu Rong himself was born in 493, during the reign of Emperor Xiaowen. When Erzhu Rong's father Erzhu Xinxing (爾朱新興) grew old, Erzhu Xinxing asked that the chief post be passed to Erzhu Rong, and the imperial government agreed. Erzhu Rong was described to be handsome, resolute, ambitious and capable in military matters, and was particularly strict in military discipline. As he saw the empire begin to degrade during Emperor Xiaoming's reign, he began to consider whether the empire would collapse, and he sold part of his livestock to gather brave warriors around him. He married a distant member of the imperial Yuan clan, the daughter of Yuan Zhen (元禎) the Prince of Nan'an, a brother of Emperor Wencheng.