爾朱世隆
Erzhu Rong refused to recognize Yuan Zhao as emperor. With support from his associate Yuan Tianmu (元天穆), 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). 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.