Southern-Sòng xiǎoxué scholar, zì Cáilǎo 才老; native of Wǔyí 武夷 (Jiànyáng, Fújiàn) — though Wáng Míngqīng’s Huīzhǔ sānlù erroneously assigns him to Shūzhōu (probably an error confusing zǔjí with jūsuǒ). Jìnshì Xuānhé 6 (1124); declined the Guǎnzhí examination. Under Shàoxīng he was Tàichángchéng; punished for drafting Mèng Rénzhòng’s cǎobiǎo in a way that offended Qín Huì 秦檜, he was demoted to Quánzhōu tōngpàn (older sources have Tōngzhōu) where he died. CBDB cbdbId 41529 has fl. 1111–1145 (consistent with the jìnshì 1124 / Shào-xīng-era career). The xù by Xú Chǎn lists five works: Shū bìzhuàn 書裨傳, Shī bǔyīn 詩補音 (10 juàn, lost; cited extensively in Zhū Xī’s Shī jízhuàn), Lùnyǔ zhǐzhǎng kǎoyì xùjiě, Chǔcí shìyīn, and the surviving Yùn bǔ KR1j0059 (5 juàn) — the last being the foundational document of post-Sòng gǔyīn (Old Chinese phonology) studies. While the Sìkù tíyào finds the Yùn bǔ itself defective and inconsistent, it concedes that “of those who wrote a separate book to elucidate Old phonology since the Sòng began, Wú Yù is the first” — and that all subsequent gǔyīnxué (Gù Yánwǔ 顧炎武 onward) descends from his initiative.