(Another possibility is that establishment of ekiden-sei was made during the time when the military system and other various systems were reformed by Emperor Tenchi after the defeat in the Battle of Hakusukinoe in 663).
（もう一つの可能性としては、白村江の戦いでの敗北（663年）後に天智天皇が軍事制度・各種制度の改革を進めた時期が挙げられる。)