承久之亂
was a Japanese history book written in the early Kamakura period, narrating events at that time in the order they occurred. The "Rokudai", which literally means six generations, refers to Emperors Takakura, Antoku, Go-Toba, Tsuchimikado, Juntoku and Go-Horikawa. The fact that Go-Horikawa is referred to as "The Reigning Emperor" (今上天皇) suggests that the book was written shortly after the Jōkyū War (1221). For a long time, Minamoto no Mitsuyuki had been considered as the author of the book. Recently, however, historians have argued that Fujiwara no Tadataka, who was retired at the time the book was written, is more likely the actual author.