The author of the 1183 preface to the [[KR5a0319|Xīyuè Huáshān zhì 西嶽華山志]] (DZ 307). He signs himself “Níyáng Liú Dàyòng Qìzhī” 泥陽劉大用器之 — Liú Dàyòng (zì Qìzhī 器之) of Níyáng 泥陽 (modern Níngxiàn 寧縣 in eastern Gānsù) — and dates the preface to the dàdìng 大定 guǐmǎo year, twelfth month, rénshēn day = 1183, the reign of Jīn Shìzōng 金世宗. He describes the unnamed Wáng gōng Zǐyuān 王公子淵 — a recently married friend who, having entered Huáshān as a Daoist master to refine the Golden Liquor, had compiled the present mountain-monograph from older sources — and says that the work’s commission is, in effect, the realisation of Liú’s own unfulfilled wish. Beyond the preface itself, no other works survive under his name. CBDB has c_personid 391130 without dates. The text’s actual author, on TC’s analysis (Schipper & Verellen 2:911), was a Quánzhēn 全真 master of Huáshān’s Lotus Peak (Liánfēng 蓮峯) — not the well-attested Wáng Chǔyī 王處一 (1142–1217) of the same lineage, whose biography places him elsewhere.