Yuwen Huaji killed Sui Emperor Yang at the palace in Jiangdu and set up Yang Hao, Prince of Qin, as emperor. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷1 義寧2年 3月)
Li Yuan ascended the throne at the Taiji Hall in Chang'an, founded the Tang, and changed the era name to Wude. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷1 武德1年 5月)
Yuwen Huaji reached Yuzhou, poisoned Prince Hao, proclaimed himself Son of Heaven, and named the state Xu. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷1 武德1年)
When Xue Ju invaded Jingzhou, Li Shimin led troops to meet him but, at a disadvantage, withdrew. (Old Book of Tang (Jiu Tangshu), Annals 舊唐書 卷2 武德1年 7月)
Xue Ju declared himself Emperor and attacked Fufeng; the Duke of Qin (Li Shimin), as Marshal, defeated him. (Book of Sui (Suishu), Imperial Annals 隋書 卷005 帝紀 義寧1年12月)
The righteous army captured Qutu Tong, General of the Brave Guard, at Wenxiang and took tens of thousands as prisoners. (Book of Sui (Suishu), Imperial Annals 隋書 卷005 帝紀 義寧1年12月)
Yuwen Huaji, General of the Right Garrison, killed the Taishang Huangdi (Emperor Yang) at the Jiangdu Palace. (Book of Sui (Suishu), Imperial Annals 隋書 卷005 帝紀 義寧2年3月)
In the eighth month of the twenty-sixth year, Goguryeo sends envoys who claim that Emperor Yang of Sui invaded with three hundred thousand men but was repulsed, and presents prisoners (Nihon Shoki (Chronicles of Japan) 日本書紀 卷第廿二 推古紀 26年 단락142)