Southern Sòng 宋 Shàngshū commentator, native of Dōngyáng 東陽 county in Wùzhōu 婺州 (modern Zhèjiāng). CBDB id 15026, with index year 1199 (consistent with his jìnshì of Shàodìng 紹定 2 / 1229 if he sat the exam in his late twenties; firm lifedates not recorded). Career was modest: he held only the lowest archival post in the central administration, Liù bù jià gé 六部架閣 (“Archivist of the Six Ministries”), and the Sòngshǐ contains neither a biography of him nor any mention in its Yìwén zhì 藝文志.
He wrote two Shàngshū works. The first, the Shū jízhuàn 書集傳 — under the same title as Cài Shěn’s much more famous Sìkù entry (KR1b0017) — is now lost (recorded only in Yè Shèng’s late-Míng Lúzhútáng shūmù 菉竹堂書目, and not seen since). The second, the Shū jízhuàn huò wèn 書集傳或問 (KR1b0023) in 2 juǎn, is the disputational companion-volume of the first, recording his answers to friends’ objections after the Jízhuàn was completed; only the Huò wèn survives. The Sìkù compilers note that he is willing to disagree both with Zhū Xī and with Cài Shěn directly; his exegesis is independent and combative, although weak on the geography of Yǔ gòng 禹貢 (he never saw the northwest in person).
He is to be sharply distinguished from the homonymous Chén Dàyóu of Dūchāng 都昌 (CBDB id 27571, in modern Jiāngxī, jìnshì 1226 [the catalog index year]), who studied under Ráo Lǔ 饒魯 (Shuāngfēng 雙峰) and authored the Shū zhuàn huì tōng 書傳會通 (lost in independent transmission). The Dūchāng Chén Dàyóu was the father of the famous Lǐjì jíshuō 禮記集說 author Chén Hào 陳澔 (1260–1341). The Sìkù tíyào on KR1b0023 explicitly warns against the conflation, noting “the world sometimes mistakenly takes them as the same person — they are not.”