Qián Chéngzhī 錢澄之 (1612–1693), original name Bǐngdēng 秉鐙, zì Yǐnguāng 飲光, hào Tiánjiān 田間, was a late-Míng / early-Qīng Confucian scholar, Yìjīng and Shī-classics polymath, poet, and Míng loyalist from Tóngchéng 桐城 (Ānqìng 安慶, modern Ānhuī 安徽). Under the Míng he held zhūshēng status; he studied the Yì with Huáng Dàozhōu 黃道周 (黃道周) (q.v.). After the dynastic transition he served briefly under the Yǒnglì 永曆 emperor of the Southern Míng before withdrawing permanently into a “field-side” (tián jiān 田間) retreat at Tóngchéng — which gave his most famous hào — and refusing all Qīng appointments.
His Yì corpus passed through three drafts: an early Yì jiàn 易見 (lost during his Fújiàn flight from Manchu armies), a memorial reconstruction Yì huǒ zhuàn 易火傳 (“written from memory after my notes burned”), and a final synthesis after he recovered the Yì jiàn manuscript on returning home — combining the two with selections from earlier commentators into the Tián jiān yì xué 田間易學 (KR1a0122). Methodologically he began with Jīng Fáng 京房 and Shào Yōng 邵雍 (hence his strong attention to xiàngshù), then turned to yìlǐ through Wáng Bì 王弼 and Kǒng Yǐngdá 孔穎達, and finally arrived at ChéngZhū as his principal authority.
His other major works include the Tián jiān shī xué 田間詩學 (parallel work on the Shī) and his collected poetry Tián jiān shī jí 田間詩集 — much admired by Qián Qiānyì 錢謙益 and Huáng Zōngxī 黃宗羲. He is one of the principal Míng-loyalist jīngxué and literary figures of the Yangtze-region intelligentsia.