Huai Su: 737-799. The year of Huai Ren's birth and death is unknown, but the preface to Wang Ji was engraved in 672. It took more than 20 years for Huairen County to accept Wang Zi. Huairen lived in the early Tang Dynasty, while Huai Su lived in the prosperous Tang Dynasty, and experienced the Anshi Rebellion. Even when the preface was engraved in 672, it was inferred that Huairen was about fifty or sixty years old, and Huairen was earlier than Huai Su by 100 years.
Master Xuanzang, calligrapher Huai Su, monk Jian Zhen and monk Huairen made outstanding contributions in the history of China's culture, art and diplomacy, which is enough to go down in history.