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|History of Manchuria|
The Didouyu (地豆于) were a 5th-century west Manchuria located steppe tribe, their neighbourhoods were the Tujue (Eastern Turk, on their west), the Rouran, and the Khitan (on their southeast). They were attacked by both Goguryeo and Rouran in 479, allied for this operation. In fear, a big part of Kithan fled southward to submit to Northern Wei.
- 太和三年, <高句麗> 竊與< >謀, 欲取<地豆于>以分之, Book of Wei.
- Xu Elina-Qian, p.264 + 296a
- Xu Elina-Qian, Historical Development of the Pre-Dynastic Khitan, University of Helsinki, 2005. 273 pages. p.264