During the middle of the Heian period, Myoho hakase tended to be a hereditary post for the Sanuki and Koremune clans, but from the medieval period, both clans were replaced and it became a hereditary post for the Sakagami and Nakahara clans of high reputation.
平安時代中期には讃岐氏や惟宗氏の世襲の傾向が見られたが、中世以降には両氏に代わって、名望の坂上氏及び中原氏の世襲となった。