劉餗 Liú Sù (fl. mid-8th century; CBDB id 31725) was the second son of the great Tang historian 劉知幾 劉知幾 (661–721). He completed the outer sections (wàipiān 外篇) of his father’s Shǐtōng 史通, the foundational Chinese work on historical methodology, in 722 CE, working from Liu Zhiji’s drafts. He served as a court official under Emperor Xuanzong during the Kaiyuan era (713–741).
His most important independent work is the Suí-Táng jiāhuà 隋唐嘉話 (KR4k0012), an anecdote collection covering events from the Sui through the Kaiyuan period, which Li Zhao’s Táng guóshǐ bǔ (KR4k0013) explicitly extended. Endymion Wilkinson (Chinese History: A New Manual, §49833) identifies Liú Sù as Liu Zhiji’s second son in connection with the Guóshǐ bǔ.
Author-name disambiguation: 劉餗 (character 餗, sacrificial millet) is distinct from 劉肅 (character 肅, solemn, CBDB 92647), the author of KR4k0008 Dà Táng Xīnyǔ. The two names are pronounced identically in Mandarin (Liú Sù) but are different persons writing in the same broad period.