Around the ninth and tenth centuries, the nation-governing system based on a framework like the Ritsuryo system (a system of centralized government based on the ritsuryo code) had changed into a decentralized system called myoden (rice field lots in charge of a nominal holder) relying on rich farmers called tato who constituted a new wealthy class.
9世紀・10世紀頃、統治体制が律令制的な枠組みから、新興階層の富豪層である田堵などに依存した名田と呼ばれる分権的な体制へ変質していった。