On the mountains southeast of Anshi Castle he heavily defeated the Goguryeo army (General Wang Junne fell). He never took Anshi Castle, and withdrew in the ninth month. (New Book of Tang (Xin Tangshu), Annals 新唐書 卷002 太宗 貞觀19年6月)
In the sixth month of the fourth year, while a memorial is being read, Soga no Kurayamada Maro breaks into a sweat from fear, and Iruka grows suspicious and asks why (the Isshi Incident) (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第廿四 皇極紀 4年 단락134)
The next day, Soga no Emishi, facing death, burns the imperial records, the national chronicles and the treasures; Funa no Fubito Esaka salvages the national chronicles and offers them to Naka no Ōe (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第廿四 皇極紀 4年 단락136)
Kōtoku ascends the throne, honors the Imperial Grandmother (Kōgyoku) as Kōso-bo no Mikoto, makes Naka no Ōe crown prince, Abe no Uchimaro minister of the left, and Soga no Kurayamada minister of the right (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第廿五 孝徳紀 단락5)
On the day Kinoto-u, the emperor, the Imperial Grandmother and the crown prince gather the ministers beneath a great zelkova tree and swear an oath (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第廿五 孝徳紀 단락7)
In the ninth month, Prince Furuhito no Ōe plots rebellion with Soga no Taguchinokawahori and others at Yoshino (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第廿五 孝徳紀 1年 단락26)
When Tang Taizong campaigned against Goguryeo, the king sent thirty thousand troops to help; Baekje took seven western fortresses in the meantime. (Samguk Sagi (History of the Three Kingdoms) 卷05 善德王 14年)
In the twelfth month, the emperor moves the capital to Toyosaki in Naniwa Nagara; a sign of the move is said to be the rats heading for Naniwa (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第廿五 孝徳紀 1年 단락33)