During the Daiei era (A.D. 1521- 1528), the Nagao clan gave both the kuji collection right and the distribution control right of aoso to the Kurata clan, which was "tonin" (the director) of Echigo so-za.
大永年間には長尾氏は越後苧座の頭人であった蔵田氏に青苧の公事徴収・流通統制権を認めた。