(The compilation period of 'Shoku Nihongi' was the times when his brother, FUJIWARA no Momokawa, and his son, Tanetsugu played central role in the government and some records might not have been written in the book due to the political situation of those days.)
（「続日本紀」の編纂時期は清成の弟・藤原百川や息子・種継が政権中枢にいた時代であり、その当時の政治的事情から敢えて記載しなかった可能性もある）