It is also indispensable for the study of political history of those times because the details of the abdication of Emperor Uda and the assessment of the people in the Imperial Court (FUJIWARA no Tokihira, SUGAWARA no Michizane, TAIRA no Suenaga, KI no Haseo and others) are included.
また、宇多天皇の譲位の事情や当時の宮中の人物評（藤原時平・菅原道真・平季長・紀長谷雄ら）も行っており、当時の政治史の研究にも欠かせない。