In 399, the general Fu Guang (苻廣), brother of the Former Qin emperor Fu Deng, had heard prophecies that Former Qin would soon be reestablished, and therefore declared a rebellion, claiming the title of Prince of Qin. Murong De personally attacked Fu Guang and killed him, but as he did so, his nephew Murong He (慕容和) the Prince of Luyang, left to guard Huatai, was assassinated by his general Li Bian (李辯), who then offered the city to Northern Wei. Northern Wei's viceroy Suhe Ba (素和跋) quickly entered Huatai and defeated returning armies commanded by Murong De and his cousin Murong Zhen (慕容鎮) the Prince of Guiyang, and the other cities of the Huatai region then surrendered to Northern Wei as well. Murong De considered putting Huatai under siege, but at the advice of his general Han Fan (韓範), who argued that sieging Huatai would be difficult, he took his troops and advanced east instead, against the Jin governor of Qing Province (青州, modern central and eastern Shandong), Pilü Hun (辟閭渾). In fall 399, he captured the capital of Qing Province, Guanggu (廣固, in modern Qingzhou, Shandong), killing Pilü, and making Guanggu his new capital. From this point on, Murong De carried out few military campaigns, appearing to be content with controlling his small but stable empire.