The 'Engishiki' (codes and procedures on national rites and prayers) which was promulgated in 923 stated that one and a half koku of hishio (a unit of volume: rice 1-koku is 180.39 liter, lumber 1-koku is 0.278 cubic meter) were made out of three koku of soy beans, and this showed that there were manufacturers and sellers of hishio in Kyoto in this period.
また923年公布の「延喜式」には大豆3石から醤1石5斗が得られることが記されており、この時代、京都には醤を製造・販売する者がいたことが分かっている。