Late-Táng / Five-Dynasties Daoist alchemist known by the hào Yuányáng zǐ 元陽子 (“Master of the Primordial Yáng”). Author and central authority for two related works in the Daozang: [[KR5a0239|DZ 238 Yuányáng zǐ jīnyè jí]] (“Master Yuányáng’s Collection on the Gold Liquor”) and [[KR5a0240|DZ 239 Huándān jīnyè gē zhù]] (“Glosses on the Song of the Gold-Liquor Returned Elixir”), the latter explicitly identifying him in its preface as the recipient of the title Tōngxuán xiānshēng 通玄先生. Although that title was famously bestowed in 734 on the Táng immortal Zhāng Guǒ 張果 by Emperor Xuánzōng 玄宗, the present author is not the same man: the Huándān jīnyè gē zhù preface, which is signed “Yuányáng zǐ xiū Tōngxuán xiānshēng zhù 元陽子修通玄先生注,” explicitly names Zhāng Guǒ as a separate authority quoted within the work. The Tōngxuán xiānshēng designation may have been a later, derivative honorific applied to Yuányáng zǐ. The works belong to the late-Táng / Five-Dynasties stratum of zhōngLǚ and cantong-derived alchemical writing — Schipper & Verellen, The Taoist Canon (2004), assigns the Yuányáng zǐ jīnyè jí to the ninth–tenth century. No CBDB record was found.