KI no Kosami who was appointed to the position ofseito shogun (literally, "general who subdues the eastern barbarians") in 788 led the Imperial army to conquer the Emishi in the following year, 789.
788年（延暦7年）、紀古佐美が征東将軍に任じられ、翌789年（延暦8年）、朝廷軍を率いて蝦夷征討へ赴く。