Book of Liang
The Book of Liang was compiled under Yao Silian and completed in 635. Yao heavily relied on an original manuscript by his father Yao Cha, which has not independently survived, although Yao Cha's comments are quoted in several chapters.
The Book of Liang is part of the Twenty-Four Histories canon of Chinese history.
Quotations on Japan and its surrounding neighbours
It contains the history of the Liang dynasty, and various descriptions of countries to the east of China. One such passage is the description by the monk Hui Shen of the country of Fusang, 20,000 li east of China.Note, the Chinese measure of distance used in the Book of Liang corresponds to 400 metres.