Siwang was called Yonglong in ancient times and belonged to Gongzhou (now Pingnan). It is one of the four ancient towns in Pingnan County. As early as the Qianlong period of the Qing Dynasty, Cantonese businessmen built a guild hall in Siwang. In the late Qing Dynasty, Qing troops were stationed in Siwang Ruins. The first battle between the Taiping Rebellion and the regular Qing army took place in Siwang, which is known in history as the Battle to Welcome the Lord.
At the end of the 30th year of Daoguang's reign (1850), on the eve of the Jintian Uprising, Guangxi Governor Lao Chongguang ordered Qinchuan to inspect Zhang Yong's Kasiwang Ruins, and the deputy general of Xunzhou, Li Dianyuan, moved to Siwang in preparation for emergencies. When Hong Xiuquan, Feng Yunshan and others were hunted by the Qing army on their way back to Jintian, they hid in Huazhou Shanren Village. In early November, Ni Tao, the magistrate of Nanzhi County in Qingping, attacked Huazhou and was defeated by Hong Xiuquan and others. Not long after, in order to save Hong Xiuquan and others from danger, Yang Xiuqing sent Meng De'en to lead thousands of troops to attack the Qing army of Li Dianyuan's tribe stationed at Siwang Ruins. Hong Xiuquan learned that the Jintian congregation was coming to help, and ordered Hu Yihuang to lead the crowd to Siwang Ruins. The two armies attacked , a major defeat of the Qing army, Li Dianyuan and Ni Tao were defeated, and Zhang Yong died in the battle. Soon Hong Xiuquan returned to Jintian and announced the uprising, named Taiping Heavenly Kingdom, and issued an imperial edict calling the battle of Siwangxu the battle to welcome the Lord. Today, under the big banyan tree at the head of Yonglong Bridge in Siwang, there is a monument to the ruins of the Battle of the Taiping Heavenly Kingdom.