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3. Dongyi Protectorate (648A.D)
Dongyi Protectorate and its precedent, Dongyi military area(东夷校尉府，was in charge of civil affairs of converted Hsi
HSI may refer to:In Science and Technology:* HSI color space, color representation coordinate system meaning Hue, Saturation, Intensity...
thumb|250px|Khitans [[Eagle hunting|using eagles to hunt]], painted during the Chinese [[Song Dynasty]].The Khitan people , or Khitai, Kitan, or Kidan, were a nomadic Mongolic people, originally located at Mongolia and Manchuria from the 4th century...
tribes. It was abandoned in the era of Empress Wu
Wu Zetian , personal name Wu Zhao , often referred to as Tian Hou during the Tang Dynasty and Empress Consort Wu in later times, was the only woman in the history of China to assume the title of Empress Regnant...
, due to the logistic problems and the change of national policies.