What you want to ask is when did Pingnan Daxin come into being? Ming dynasty. According to personal library records, there is a famous Shilongkou tomb in Daxin, Pingnan, which is the tomb of Zhang Zhi, the great-grandfather of Zhang Tinglun, the secretariat of Nanjing in the Ming Dynasty. Address of Daxin Town: Pingnan County, Guigang City, Guangxi Zhuang Autonomous Region.