Liú Juānzǐ 劉涓子 (fl. late Jìn / early LiúSòng, late 4th – early 5th c.), the legendary author of the foundational early-medieval Chinese surgical formulary KR3ek040 Liú Juānzǐ guǐyí fāng 劉涓子鬼遺方. Native of Jīngkǒu 京口 (modern Zhènjiāng, Jiāngsū); described as a military physician active under Jìn Āndì 晉安帝 (r. 397–418) and in the northern campaigns of Sòng Wǔdì Liú Yù 劉裕 (r. 420–422). The standard founding-narrative xùlùn of the guǐyí fāng has Liú, hunting at twilight in Dānyáng 丹陽, shoot a supernatural giant (“Huángfù guǐ 黃父鬼”); the next morning he tracks blood to the ghost’s lair, finds three figures preparing medicine, scatters them, and seizes a scroll titled Yōngjū fāng 癰疽方 — the “ghost-bequeathed prescriptions” of the work’s title. The formulae were then transmitted within Liú’s family to Dàoqìng 道慶, and from him to the Southern-Qí editor 龔慶宣 who produced the surviving 499 CE recension. The legendary character of the founding story does not alter the documentary value of the formulae themselves, which represent an authentic Chinese surgical-medical apparatus of the late 4th / early 5th century. Not in CBDB.