On June 17 in the previous year of the enforcement of the Sanze-isshin Law, there was a project for a million hectares of land cultivation among the policies which Dajokan (Grand Council of State) had reported to the throne and was approved.
三世一身法施行の前年の閏4月25日（旧暦）、太政官が奏上し裁可された政策の中に百万町歩開墾計画があった。