From around the last half of ninth century in the early Heian Period, when regency was introduced to Japanese politics, it became called just 'Kanso' for Daijokan (the Grand Council of State) to submit to the Emperor the reports which it had received from various provinces.
平安時代前期、摂関政治が導入された9世紀後半頃から、諸国からの上申文書を太政官が奏上する行為を単に「官奏」と呼ぶようになった。