Washi is made from the paper mulberry which is a plant that grows in the city of Mino.
[1] During the Heian period, government officials were dispatched to the area when paper standards, such as size and color, were first established.
Also, the Toki clan, who served as the shugo of Mino Province at the time, promoted industries and paper production as a way of strengthening the area and their power.
As a result, Mino washi and other goods that traveled from the upper-Mino region came ashore in the city and were sold in many tonya.
The tonya in the Kawara-machi area of the city managed to survive the Gifu air raid during World War II, so the tradition continues today much as it has for hundreds of years.