It is generally assumed that the predecessor of Chinju-fu was Chinjo (Pacification headquarters) mentioned in Shoku Nihongi (Chronicle of Japan Continued), which was attached to Taga-jo Castle where Mutsu kokufu (the provincial capital of Mutsu province) is supposed to have been located.
一般的に、鎮守府の前身は『続日本紀』に見える「鎮所」（ちんじょ）であり、陸奥国府があったとされる多賀城付近に併設されていたものと推測されている。