But josaku went into a rapid decline since around the 10th century along with the end of the government's policy against barbarians, and by the 11th century, it had disappeared from historical documents as well as archeological records.
しかし、征夷政策の収束と共に10世紀頃から急速に城柵は廃れ、11世紀には史料上からも考古学的成果からも消滅する事が確認されている。