In the legend, Ondo-no-seto was excavated under the leadership of Taira no Kiyomori from 1164 to 1167 during the Heian period, to allow passage of trading ships for trade with China.
In the legend, Ondo-no-seto was unearthed under the guidance of Taira no Kiyomori from 1164 to 1167 during the Heian period, to facilitate trade with China through ships.