to be executed. Also in spring 806, Yang Huilin, the nephew of the general Han Quanyi () the military governor of Xiasui Circuit (夏綏, headquartered in modern Yan'an, Shaanxi), seized control of the circuit after Han had been ordered to retire and resisted imperial orders. With imperial forces approaching Xiasui's capital Xia Prefecture (), Yang was quickly killed by his own subordinate Zhang Chengjin (), ending his rebellion. Around the same time, the warlord Li Shigu, the military governor of the powerful Pinglu Circuit (平盧, headquartered in modern Tai'an, Shandong), died, and his subordinates supported his brother Li Shidao to succeed him. Du advocated trying to divest Pinglu of some of its territory, but Emperor Xianzong, believing that with the campaign against Liu not over by that point, that he should not wage another campaign, and therefore allowed Li Shidao to inherit Pinglu. After Liu's and Yang's destruction, another warlord, Li Qi the military governor of Zhenhai Circuit (鎮海, headquartered in modern Zhenjiang, Jiangsu) became apprehensive, and, as a means of showing loyalty, requested to go to Chang'an to pay homage to Emperor Xianzong. He did not actually intend to do so, however, and after Emperor Xianzong not only approved, but issued an edict summoning him when he did not depart Zhenhai immediately, rebelled against the imperial government. Before imperial troops could attack him, however, he was captured by his own subordinates and delivered to Chang'an to be executed. Around that time, another warlord, Yu Di the military governor of Shannan East Circuit (山南東道, headquartered in modern Xiangfan, Hubei), fearing Emperor Xianzong, went to Chang'an and yielded control of the circuit to the imperial government, after Emperor Xianzong had ensured Yu's loyalty by marrying his daughter Princess Puning to Yu's son Yu Jiyou (). In 808, an incident occurred that, as later historians opined, precipitated the later partisan struggles between the "Niu Party" and the "Li Party" that would eventually occur throughout the reigns of the five emperors after Emperor Xianzong. At a special imperial examinations where Emperor Xianzong ordered that low-level officials submit honest opinions about the government, several of the examinees—Niu Sengru, Li Zongmin, and Huangfu Shi () stated, without using any veiled language, the issues they saw with the governance at the time. The officials that Emperor Xianzong put in charge of the examinations, Yang Yuling () and Wei Guanzhi ranked them high. However, the chancellor Li