Book of the Later Han

The Book of the Later Han is one of the official historical works which was compiled by in the 5th century, using a number of earlier histories and documents as sources. It covers the history of Eastern Han from 25 to 220 .

The book is part of early four historiographies of the Twenty-Four Histories canon, together with the ''Records of the Grand Historian'', ''Book of Han'' and ''Records of Three Kingdoms''. Fan Ye used a number of earlier histories, including those accounts by Sima Qian and Ban Gu, plus many others most of which have not survived intact. The final 30 volumes of the book or the 8 treatises on law, rituals, sacrifices, astronomy, five elements, geography, officials, chariots and garments taken from the ''Sequel of the Book of Han'', a work composed by Sima Biao in the 3rd century were added in the 6th century by Liu Zhao during his annotation.

The ''Records of the Western Regions'' are based on a report composed by General Ban Yong and presented to the Emperor about 125, probably included notes by his famous father, General Ban Chao. It forms the 88th volume of the ''Hou Hanshu'' and is a key source for the cultural and socio-economic data on the Western Regions, including the earliest accounts of Da Qin .

Fan Ye, himself, clearly says that the new information contained in this section on the Western Regions, is largely based on information from the report of General Ban Yong to the Emperor ''c''. 125 CE.

:"Ban Gu has recorded in detail the local conditions and customs of each kingdom in the former book . Now, the reports of the Jianwu period onwards recorded in this 'Chapter on the Western Regions' differ from the earlier ; they are from Ban Yong’s report at the end of Emperor An , and so on."