Volume 27 of "Chronicles of Japan" deals with the period of Emperor Tenchi, volumes 28 and 29, the period of Emperor Tenmu and the last volume 30, the period of Emperor Jito.
『日本書紀』の巻27は天智天皇の時代、巻28と29は天武天皇の時代、最終の巻30は持統天皇の時代を扱う。