Didouyu
The Didouyu or Didougan was a tribe during the 5th-century in western Manchuria. Their territory included the Tujue, the Rouran, and the Khitan. 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. Didouyu were one of the northern branches of the Xianbei.