The , also translated loosely as âÂÂcommander-in-chief of the defense of the northâÂÂ, was a military post in classical and feudal Japan. Under the command of the seii taishà Âgun, the chinjufu shà Âgun was primarily responsible for the pacification of the Ezo people of northern Honshà « and Hokkaidà Â, and Japan's defense against them.
The post was originally created during the Nara period. A military district, called was established as the chinjufu shà Âgun's area of authority. It was originally located in the fortress of Tagajà  in what is now Miyagi Prefecture. However, it was moved further north in 801, after the chinjufu shà Âgun at the time, Sakanoue no Tamuramaro achieved a series of victories against the natives, pushing them further north. Once all of Honshà « was conquered, or pacified, by the Japanese, the new base at Isawa came to be controlled by the various samurai clans of that region. The castle, along with the chinjufu military district and the position of chinjufu shà Âgun, was abandoned in the early 14th century.