With the onset of the eighth century, the Ritsuryo system taken from China was implemented and the centralized authoritarian rule centering on Emperor was established; accordingly, Emperor directly administered the government (the Emperor System in the ancient sovereignty).
8世紀になると中国の政治体制に倣った律令制が整備され、天皇を中心とした中央集権制が確立し、親政が行われた（古代天皇制）。