The contents between the part of Emperor Reizei in the fourth volume and the part of Emperor Konoe in the seventh volume are the extracts from "Honcho Seiki" (Chronicle of Imperial Reigns) by FUJIWARA no Shinzei, which are valuable because a lot of parts of the original book has been scattered and ultimately lost.
巻4の冷泉天皇から巻7途中の近衛天皇までは藤原信西『本朝世紀』の抄出であるが、同書自体の散逸が多いため貴重である。