Southern-Sòng Zhèjiāng Daoist scholar and inner-alchemy writer, zì Zōngyù 宗禹, hào Yúnfēng sǎnrén 雲峰散人. Active in the Lǐnánfǔ 臨安府 area in the 1220s. He studied inner alchemy under an (unnamed) adept on Mount Héng 衡山 and was a prolific writer on nèidān 內丹 topics. His surviving works in the Daoist canon include:
- Huángdì yīnfú jīng jiǎngyì 黃帝陰符經講義 (DZ 110, preface 1226, postface 1227) — an inner-alchemical discussion-commentary on the Yīnfú jīng 陰符經.
- Zǐyáng zhēnrén Wùzhēn piān jiǎngyì 紫陽真人悟真篇講義 (DZ 146) — a commentary on Zhāng Bóduān’s Wùzhēn piān.
- The lost Yúnfēng jīndān sānshū 雲峰金丹三書 (“Three Books on the Gold Elixir”), partial traces preserved in juan 4 of DZ 110.
- A no-longer-extant commentary on the Cuīgōng rùyào jīng 崔公入藥鏡.
Xià Yuándǐng is a Representative figure of the Southern-Sòng Zhèjiāng inner-alchemy circle, drawing explicitly on the Mount Héng adept-transmission and integrating Yīnfú jīng, Wùzhēn piān, and Rùyào jīng traditions into a unified nèidān apparatus. No CBDB record was found.