Zhū Yuánshēng 朱元昇 (lifedates not securely recorded; fl. mid-thirteenth century, Lǐzōng / Dùzōng), zì Rìhuá 日華. Native place not preserved in the historical record. CBDB id 39508 records him without lifedates or further detail.
Career: held Chéngjié láng 承節郎 (a low wǔjiēguān / military rank); seconded as xúnjiǎn 巡檢 (Patrol Inspector) in Lóngquán 龍泉, Suìchāng 遂昌, Qìngyuán 慶元 prefectures of Chǔzhōu 處州 (modern southern Zhèjiāng) and in Sōngxī 松溪, Zhènghé 政和 prefectures of Jiànníng 建寧 (modern Fújiàn). His career-arc — substantial Yì-scholarship paired with low-level military patrol-inspector posts — is typical of the late-Sòng Dàoxué periphery.
Patronage: substantial connection to Jiā Xuánwēng 家鉉翁 (1213–1297), the Liǎngzhè tíxíng and major late-Sòng Dàoxué defender. Jiā Xuánwēng submitted Zhū Yuánshēng’s Sān Yì bèi yí to the late-Sòng court c. 1272 — three years before the Línān fall.
Within the Kanripo corpus he is the author of KR1a0063 Sān Yì bèi yí 三易備遺 — a 10-juan late-Sòng Shào-Yōng-school xiàngshù compilation reconstructing the three traditional Yì’s (Liánshān / Xiāntiān; Guīzàng / Zhōngtiān; Zhōuyì / Hòutiān) plus the Hé túLuò shū foundation. Composed by 1270 (auto-preface dated Xiánchún gēngwǔ / 1270 winter solstice); published posthumously by his son Zhū Shìlì 朱士立.
Methodologically distinctive for: (a) following Liú Mù’s KR1a0011 Hé túLuò shū numerology line against ZhūXí orthodoxy; (b) reconstructing Liánshān via Xià-period seasonal-qì calendar; (c) reconstructing Guīzàng via gānzhī nàyīn (Stem-Branch sound-correspondence); (d) systematic deployment of fǎnduì and hùtǐ doctrines for the Zhōuyì exposition.