He then withdrew, and he gave a daughter in marriage to Wang Zhaozuo. Wang Rong thereafter became a vassal of Zhu's. After Wang Rong agreed to become Zhu Quanzhong's vassal, another assistant of his, Zhang Ze (), pointed out that Yiwu and Lulong remained affiliated with Hedong (as, despite the earlier formal break from Li Keyong, Liu Rengong and Li Keyong had assisted each other when under attack from Zhu), and that Chengde needed to continue to worry about a joint attack by all of those circuits. He suggested to Wang that Wang persuade Zhu to attack and conquer Yiwu and Lulong, so that thereafter Chengde would not need to worry about a Hedong attack in coordination with those circuits. Wang therefore had Zhou Shi submit that suggestion to Zhu. Zhu was pleased, and he sent his general Zhang Cunjing () north to attack Lulong and Yichang first, capturing Ying (), Jing (), and Mo () (all in modern Cangzhou) Prefectures. However, after Zhang's path north toward You Prefecture was blocked by flooding, he attacked Yiwu to the west instead. After his troops dealt a crushing blow to Yiwu troops, Wang Gao fled. The remaining Yiwu soldiers supported Wang Chucun's brother Wang Chuzhi as Wang Gao's successor, and Wang Chuzhi subsequently persuaded Zhu to withdraw his troops by agreeing to be a vassal as well. In 903, after the chancellor Cui Yin and Zhu jointly slaughtered all of the eunuchs in the imperial administration at Chang'an (an event that also marked the end of any independent imperial power, as Zhu controlled the emperor from this point on), an imperial edict ordered Wang to supply 50 eunuchs from the Chengde region to serve as new imperial servants in the palace, on account of the people in the region being considered kinder and gentler. After Zhu forced Emperor Zhaozong to move the capital from Chang'an to Luoyang and then assassinated Emperor Zhaozong in 904, he forced Emperor Zhaozong's son and successor Emperor Ai to yield the throne to him in 907, ending Tang Dynasty and establishing a new Later Liang with Zhu as its Emperor Taizu. Wang Rong, whose Chengde Circuit had been renamed Wushun Circuit () by this point (to observe naming taboo as Zhu's father was named Zhu Cheng (), recognized Zhu as the new emperor.