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Detailed geographical information about the Roman Empire, at least its easternmost territories, is provided in traditional Chinese historiography. The "Shiji" by Sima Qian (c. 145–86 BC) gives descriptions of countries in Central Asia and West Asia. These accounts became significantly more nuanced in the "Book of Han", co-authored by Ban Gu and his sister Ban Zhao, younger siblings of the general Ban Chao, who led military exploits into Central Asia before returning to China in 102 AD. The westernmost territories of Asia as described in the "Book of the Later Han" compiled by Fan Ye (398–445 AD) formed the basis for almost all later accounts of Daqin. These accounts seem to be restricted to descriptions of the Levant, particularly Syria.