noun
Shoku Nihon Kōki
The fourth of the Six National Histories (六国史), covering the period 833–850. A proper noun referring to a specific classical Japanese history text.
See also: 六国史
続日本後紀は、六国史の四番目にあたる歴史書です。
Shoku Nihon Kōki is the fourth of the Six National Histories.
六国史 is the collective term for the six classical Japanese history texts, of which 続日本後紀 is the fourth.
The title 続日本後紀 literally means 'Later Chronicles of Japan Continued', indicating it is a continuation of the earlier 日本後紀 (Nihon Kōki).