Tato that became deeply involved in the management of Imperial demesne, obtaining the position of myoshu (owner of rice field), not only ran the management of cultivated land but also developed new rice fields by themselves, and became feudal lords or kaihatsu-ryoshu (local notables who developed the land).
公領経営に深く携わるようになった田堵は、名主の地位を得て耕地の経営に当たるとともに、自ら墾田して領主（開発領主）となった。