Erzhu Rong (爾朱榮) (493 – 1 November 530wuxu day of the 9th month of the 2nd year of the Zhong Datong era, per volume 154 of Zizhi Tongjian. Emperor Xiaozhuang's biography in Book of Wei recorded the same date, but recorded the year as the 3rd year of the Wutai era.), courtesy name Tianbao (天寶), formally Prince Wu of Jin (晉武王), was a general of the Xianbei-led Chinese Northern Wei dynasty. 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, effectively ruling as military dictator of the Northern Wei State. He then contributed much to the rebuilding of the Northern Wei state by putting down the various agrarian rebellions that had fractured the state 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. Unlike Dong Zhuo however, by accounts of Wei Shou, the author of Northern Wei's official history, the Wei Shu, Erzhu Rong's military skills had few equals in his time, and he is not recorded to have ever lost a battle.
During Emperor Xiaoming's reign Erzhu Rong's ancestors were hereditary chiefs of the Qihu (契胡) tribe of Jie extraction, and they used Erzhu as their family name after settling on Erzhu River (modern Zhujia River, Shanxi). 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 a pale-skinned man who was 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.
In 524, as Northern Wei was in the middle of facing a large number of agrarian rebellions, a man from Xiurong, Qifu Moyu (乞伏莫于), started a rebellion as well in Xiurong, and he was soon joined by a shepherd, Wanyu Qizhen (萬于乞真), killing the general Lu Yan (陸延), whom the imperial government had sent against them. Erzhu used his own private forces to defeat Qifu and Wanyu. As a result of this victory, he received a general commission, and he started to further accumulate soldiers, soon engaging in campaigns to defeat more rebels around the region. He thus received increasing authorities and honors, and was by 526 the Duke of Liang Commandery. That year, when he approached the government-held Si Province (肆州, roughly modern Xinzhou, Shanxi), the governor of Si Province, Wei Qingbin (尉慶賓) became apprehensive of his intentions and refused to let him enter. This drew Erzhu's ire, and he attacked Wei, seizing him and commissioning his uncle Erzhu Yusheng (爾朱羽生) as governor without imperial permission. From this point on, it became increasingly difficult for the imperial government to control Erzhu Rong.
Sometime during Emperor Xiaoming's reign, Emperor Xiaoming took Erzhu Rong's daughter Lady Erzhu as a concubine.
Campaign against Empress Dowager Hu and the Heyin Massacre By 528, the ambitious Erzhu Rong had seen that Empress Dowager Hu, who was serving as Emperor Xiaoming's regent, had grown increasingly unpopular with the people due to her toleration of corruption by her lover Zheng Yan (鄭儼) and Zheng's associate Xu Ge (徐紇). Under advice from his generals Gao Huan and Heba Yue and close friend Yuan Tianmu, Erzhu considered waging a campaign to end Empress Dowager Hu's regency, and therefore prepared his army for campaign, while claiming that he was seeking to attack the rebel Ge Rong, who had claimed the title Emperor of Qi. Empress Dowager Hu, under advice from Xu, tried to alienate Erzhu's generals from him by awarding them "iron certificates" (鐵券, tie quan, advance promises to pardon death-eligible crimes), and when Erzhu realized this, he became increasingly resentful of Empress Dowager Hu.
Meanwhile, Emperor Xiaoming, who was then 18 years old, was not any happier about Empress Dowager Hu's toleration of corruption and hold on power than Erzhu. He sent secret messengers to Erzhu, ordering him to advance on Luoyang to force Empress Dowager Hu to give up power and to kill Zheng and Xu. Erzhu therefore started heading toward Luoyang. However, for reasons unknown, Emperor Xiaoming then sent another messenger to him to order him to stop, but the news still leaked. Zheng and Xu advised Empress Dowager Hu to poison Emperor Xiaoming, and she did so. She, after initially declaring a child of Emperor Xiaoming emperor, soon admitted that the child was a daughter, not a son, and therefore ineligible for the throne. She then declared Yuan Zhao, a two-year-old child and son of Yuan Baohui (元寶暉) the Prince of Lintao (a distant cousin of Emperor Xiaoming), emperor.
Erzhu refused to recognize Yuan Zhao as emperor. With support from Yuan Tianmu, he issued a harshly worded statement accusing Zheng and Xu of poisoning Emperor Xiaoming. Empress Dowager Hu sent Erzhu Rong's cousin Erzhu Shilong to try to persuade him to change his mind, but Erzhu Shilong instead encouraged him to continue his resistance. He therefore prepared to advance south, and meanwhile sent messengers to persuade Emperor Xuanwu's well-regarded cousin Yuan Ziyou the Prince of Changle to accept the throne as a competing claimant to the throne. Yuan Ziyou agreed, and as Erzhu Rong approached Luoyang, Yuan Ziyou and his brothers Yuan Shao (元劭) the Prince of Pengcheng and Yuan Zizheng (元子正) the Duke of Bacheng secretly left Luoyang to join Erzhu's army. Erzhu declared him emperor (as Emperor Xiaozhuang). In turn, Emperor Xiaozhuang created Erzhu the Prince of Taiyuan. As soon as news of Emperor Xiaozhuang's ascension reached Luoyang, Luoyang's defenses collapsed, and Zheng and Xu, abandoning Empress Dowager Hu, fled, while the generals Zheng Xianhu (鄭先護, Zheng Yan's cousin) and Fei Mu (費穆) surrendered to Erzhu Rong.
Upon hearing the news of the surrender, Empress Dowager Hu ordered all of Emperor Xiaoming's consorts to become nuns. She herself took tonsure as well, but did not declare herself a nun. Erzhu ordered the imperial officials to welcome Emperor Xiaozhuang into the capital, and the officials complied. Erzhu then sent cavalry soldiers to arrest Empress Dowager Hu and Yuan Zhao and deliver them to his camp at Heyin (河陰, near Luoyang). Once Empress Dowager Hu met Erzhu, she tried to repeatedly explain and defend her actions. Erzhu became impatient of her explanations, and he left abruptly and ordered that Empress Dowager Hu and Yuan Zhao be thrown into the Yellow River to drown.
Empress Dowager Hu and Yuan Zhao would not be Erzhu's only victims. Fei suggested to Erzhu that since his army was actually small, as soon as the imperial officials realized the situation, they would resist him. He suggested that Erzhu carry out a massacre of the imperial officials, and Erzhu, despite the opposition of his strategist Murong Shaozong, proceeded. Erzhu ordered the imperial officials to his camp at Heyin (河陰, near Luoyang) under the pretense that Emperor Xiaozhuang was going to offer sacrifices to heaven and earth there, and surrounded the imperial officials, slaughtering over 2,000 of them, including Emperor Xiaozhuang's uncle, the prime minister Yuan Yong the Prince of Gaoyang. Erzhu also sent soldiers to assassinate Yuan Shao and Yuan Zizheng, while putting Emperor Xiaozhuang under effective arrest in the army camp.
Emperor Xiaozhuang, in fear and anger, sent a messenger to Erzhu, suggesting that he would be willing to yield the throne, either to Erzhu or to yet another person that Erzhu designated. Erzhu, under suggestion of Gao Huan, contemplated taking the throne himself or offering it to Yuan Tianmu, himself a member of the imperial clan, albeit distant from the recent emperors' lineage. Subsequently, however, his sorcerer Liu Lingzhu (劉靈助) predicted that neither Erzhu himself nor Yuan Tianmu were favored to be emperor by the gods, and that only Emperor Xiaozhuang was favored. Erzhu therefore stopped those plans and offered an apology to Emperor Xiaozhuang, claiming that the massacre was a result of the soldiers going out of control. However, the people of Luoyang and the surviving imperial officials, fearful of further massacre, fled Luoyang, leaving it nearly empty, particularly because Erzhu publicly pondered the idea of moving the capital to Jinyang (晉陽, in modern Taiyuan, Shanxi). It was not until Erzhu offered offices to the heirs of the officials who died and publicly renounced the idea of moving the capital that the people began to return to Luoyang.
During Emperor Xiaozhuang's reign Nevertheless, Erzhu Rong, while publicly returning authority to Emperor Xiaozhuang, retained command of the armed forces, while putting several officials closely aligned with him, including Yuan Tianmu and his cousin Erzhu Shilong, into high positions, and kept a close watch on Emperor Xiaozhuang even though he was largely away from the capital. He also wanted Emperor Xiaozhuang to marry his daughter as his empress. Because this constituted incest under Confucian traditions, Emperor Xiaozhuang hesitated, but under the suggestion of the official Zu Ying (祖瑩), who advised that this marriage would be advantageous, Emperor Xiaozhuang agreed.
Emperor Xiaozhuang was said to be diligent in governmental matters, and even though Erzhu was not particularly pleased with the development, Emperor Xiaozhuang proceeded to take much interest in criminal matters, as well as refusing to comply with all of Erzhu's recommendations for officials. He did not dare to directly cross Erzhu, however, and Erzhu continued to install officials close to him in the imperial administration.
Meanwhile, Erzhu proceeded to try to reunify the empire, which had been largely divided by agrarian rebellions that rose during the reign of Emperor Xiaoming. At that time, the more major rebels included:
Ge Rong, with an army largely of Xianbei soldiers from the six garrisons on the northern borders, with the title of Emperor of Qi and controlling most of the provinces in modern Hebei Xing Gao, with an army largely consisting of refugees from Ge Rong's and other associated rebellions, with the title of Prince of Han and controlling most of the provinces in modern Shandong Moqi Chounu, with the title of emperor and controlling most of the provinces in Shaanxi and eastern Gansu
Erzhu's first target was Ge, who had put the important city Yecheng under siege and was getting close to the Yellow River. With just 7,000 cavalry soldiers, Erzhu caught the much larger Ge army by surprise and crushed it, capturing Ge and delivering him to Luoyang, where Ge was executed in winter 528. Ge's general Han Lou (韓樓) took part of his army and took over modern Beijing and Tianjin.