Zhang Bu (, died 32 AD), courtesy name Wengong (), was a major warlord in Eastern China (mainly in Shandong) during the Xin and early Eastern Han periods. He was from Langya Commandery in Xu Province. As a warlord In 22, when Liu Xiu and others revolted against Wang Mang, Zhang Bu and his brothers also led thousands of soldiers and conquered, first his hometown Buji County (, in modern Qingdao), and later, the entire Langya Commandery. He called himself the Five Majestic General (). In 23, the Han Gengshi Emperor (Liu Xuan) in Luoyang began a policy of recognizing independent warlords in hopes of winning their support. Liu dispatched messengers to Zhang Bu and granted him the title General-in-Chief Who Supports Han (). Zhang Bu's brothers Zhang Hong (), Zhang Lan (), and Zhang Shou () all received titles. Meanwhile, Zhang Bu enlarged his territory by capturing the Taishan, Chengyang, Donglai, Gaomi, Jiaodong, Beihai, Qi, and Jinan Commanderies, gaining effective control of most of the Shandong Peninsula. The Gengshi Emperor tried to test Zhang Bu's "loyalty" by sending Wang Hong () to Langya to serve as its administrator, but Zhang Bu refused to let him take office. Wang Hong attacked Zhang Bu and took Ganyu and five other counties, but was unable to overcome Zhang Bu's dominance in the area. In 24, the Prince of Liang Liu Yong turned against the Gengshi Emperor and became independent. Seeking Zhang Bu's support, Liu Yong confirmed his title, gave him the enfeoffment Marquis Zhongjie (, "the loyal and continent marquis"), and granted him the right to Qing Province and Xu Province. Zhang Bu accepted this arrangement. Their alliance frightened Wang Hong, who decided to submit to Zhang Bu and become his subordinate. Zhang Bu allowed him to administer Langya Commandery. In 26, Liu Xiu (Emperor Guangwu of Han) defeated Liu Yong and sent Fu Long () to Zhang Bu to solicit his allegiance. Zhang Bu sent a messenger to go to Luoyang with Fu Long as a show of submission. In 27, however, Liu Xiu only named Zhang Bu the Administrator of Donglai even though Zhang controlled twelve commanderies. On the other hand, Liu Yong gave Zhang Bu the title Prince of Qi (, so Zhang Bu executed Fu Long and switched his allegiance to Liu Yong. Soon, Liu Yong was defeated and killed, so Zhang Bu sought alliance with the warlord