Misho, which is considered to be the original form of miso, was written in the literature already in Nara period, and the existence of misho stores in the western market of Heian-kyo (the ancient capital of Japan in current Kyoto) is recorded.
奈良時代にはすでに文献にも味噌の原型と思われる未醤が確認でき、平安京の西市には未醤屋の存在が記録されている。