Tang of Shang
In summer 552, with Xiao Yi and Hou Jing battling each other, Xiao Yi sought help from Western Wei and agreed to cede Nanzheng (南鄭, in modern Hanzhong, Shaanxi) to Western Wei, but the order was declined by Xiao Yi's cousin, Xiao Xun (蕭循). Yuwen and his general Daxi Wu (達奚武) thus attacked Hanzhong. Xiao Xun instead turned to another brother of Xiao Yi, Xiao Ji the Prince of Wuling for aid, and Xiao Ji sent reinforcements commanded by the general Yang Qianyun (楊乾運). Yuwen and Daxi put Nanzheng under siege, and due to the length of the siege, Yuwen and Daxi became angry and ordered that the city be slaughtered when it falls, but at the intercession of Xiao Xun's chief of staff Liu Fan (劉璠), whom Western Wei forces captured during the siege and whose talent Yuwen respected, Yuwen rescinded the order. Soon thereafter, Xiao Xun surrendered, and Nanzheng was in Western Wei hands. Yuwen initially agreed to allow Xiao Xun to return to Liang, but instead detained him, releasing him only after Liu again persuaded him to do so, reminding him of his promise. (During the conversation Liu had with Yuwen, Liu commented that he initially thought of Yuwen as Tang of Shang and King Wu of Zhou, but because of his failure to follow his promise, found him to be less than Duke Huan of Qi and Duke Wen of Jin. Yuwen instead compared himself to Yi Yin (伊尹, a legendary regent of Shang Dynasty) and Duke of Zhou, apparently disavowing intentions on the throne for the time being.)