Therefore, another reform was implemented in the early Heian period, and an imperial decree was issued in 806, whereby Shoo (princes who didn't receive any proclamation to be an Imperial Prince) aged over 10 and the children or grandchildren of government officials of Goi (Fifth Rank) and above were required to attend Daigaku-ryo.
そのため、平安時代初期に再度の改革が行われ、806年には10歳以上の諸王と五位以上の官人の子孫の就学を義務付ける勅が出された。