When first written, a genealogical table of the Imperial line, a genealogical table of the gods, and a genealogical table of astrology appear to have been included, but these have been lost, with the surviving books being especially detailed on the Fujiwara and the Minamoto clans (because both had taken over key positions in the court society) among the distinguished families which included the Minamoto, the Taira, the Fujiwara, and the Tachibana (also known as the Gen, Pei, To, Kitsu due to Chinese readings of the characters in their names).
成立当初は帝皇系図・神祇道系図・宿曜道系図を伴ったらしいが失われ、現存する部分は源平藤橘のうち藤原氏・源氏の両氏（いずれも長く宮廷社会の中枢にいた）に詳しい。