Feng Ba
Because Gao Yun was insecure about how he felt he had little contributions to the people or to his own place on the throne, he employed many skillful guards to protect him. He further began to favor two jesters named Li Ban (離班) and Tao Ren (桃仁), to have Li and Tao be in charge of security. He awarded them with great wealth, and their foods and clothes could match those of Gao Yun himself. Despite this, he was assassinated in winter 409—an event that is mysterious in its cause and scope. Traditional histories, including the "Jin Shu" and the "Zizhi Tongjian", record that Li and Tao, despite Gao Yun's favors to them, were still not satisfied, and they assassinated Gao Yun out of that dissatisfaction. Yet, this does not appear to be a true reason for the assassination. Gao Yun's wife Empress Li appears to have also died in the incident. Feng Ba, upon hearing of the assassination, readied his troops and waited for the situation to become clear, but two off his soldiers Zhang Tai (張泰) and Li Sang (李桑) advanced into the palace and beheaded Li and Tao. The officials all supported Feng Ba to take the throne, and so he did. (No reference was made to Gao Yun's son Gao Pengcheng.) (Some historians consider Gao Yun as the first emperor of Northern Yan and consider Feng Ba its second emperor, while some consider Gao Yun as the last emperor of Later Yan and Feng Ba as Northern Yan's first emperor.)