In the second half of the 7th century, the Dazaifu government office was in charge of the Kyushu area and the two islands of Iki and Tsushima, and it was a base of defense and diplomatic relations at that time. The corner stones of the remains of the capital towers 'tofuro' remain in Dazaifu city.
Discovered on 12-3-1977 in Kiso by Kosai, H., Hurukawa, K.