He also compiled a number of historical events from the Eastern Han, Cao Wei, Jin, Northern Zhou, and Sui, commenting on their successes and failures and the reasons, into a 30-volume work known as the Summaries of the Six Dynasties (六代略).
During Tang, he was a major proponent for the compilation of the histories of Sui and its predecessor Northern Zhou and was eventually put in charge of compiling Northern Zhou's official history Book of Zhou, which was completed in 636.
Yuwen Tuo, outwardly a ruthless warrior, is also the last prince of the fallen Northern Zhou Dynasty.
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Empress Yang Lihua (561–609), empress of the Chinese/Xianbei dynasty Northern Zhou
Yuchi Chifan's grandfather Yuchi Jiong the Duke of Shu was a renowned general of Northern Zhou and a nephew of Yuwen Tai, Emperor Xuan's grandfather, making her and Emperor Xuan cousins.
In 580, after Northern Zhou captured the region between the Yangtze and Huai from Chen, Emperor Xuan made an attempt to recapture the territory, and Xiao served in the campaign along with Emperor Xuan's nephew Chen Huiji (陳慧紀), but after he was unable to capture Guangling (廣陵, in modern Huaiyin, Jiangsu), he withdrew.
Emperor Xiaomin of Northern Zhou (542 – 557), an emperor of the Chinese/Xianbei dynasty Northern Zhou