Actually, however, it was done by Sadayori ROKKAKU (the father of Yoshikata ROKKAKU who was killed by Nobunaga), daimyo of the south of the Omi Province during the Sengoku Period, for the first time.
が、実際には近江国南部の戦国大名であった六角定頼（信長に滅ぼされた六角義賢の父）が最初に行なった施策である。