The documents are extremely important in the context of the history of cultural exchanges between Japan and China. They are also important for learning about legal matters in the Tang Dynasty and ...
such as Korea and Japan. They looked to Tang Dynasty rulers in order to use their experiences to strengthen their states.
The passage is said to be a Chinese poem that Japan's Emperor Tenmu’s grandson Prince Nagaya (684?-729) sent to the Tang Dynasty’s high monk Ganjin (Jianzhen) (688-763) about 1,300 years ago.