In the Heian period, the position of sho hakase became monopolized by the Saeki clan of Tado District, Sanuki Province but as demonstrated by the fact that Jichie, who is thought to have been the first To-ji choja (the chief abbot of To-ji Temple), studied Confucianism under SAEKI no Sakemaro, sho hakase (although Jichie himself was of the Saeki clan.
平安時代に入ると、書博士の地位を讃岐国多度郡出身の佐伯氏が独占するようになるが、初代東寺長者とされる実恵が書博士の佐伯酒麻呂らから儒学を学んだと伝えられる（ただし、実恵自身も佐伯氏の出身である。