Wú Yù 吳聿 (fl. mid-12th c.)
Zì Zǐshū 子書; self-styled “a man of Chǔdōng” 楚東人 — Chǔdōng being a broad geographical designation for the eastern reaches of the former Chǔ region, encompassing modern Húběi, Húnán, Ānhuī, and Jiāngsū, so that the exact native place cannot be fixed. Chén Zhènsūn’s Shūlù jiětí records the work and adds “his identity is unknown.”
Internal evidence in his Guānlín shīhuà 觀林詩話 (KR4i0026) fixes a Southern-Sòng dating: the book cites poets from Sū Shì 蘇軾 and Huáng Tíngjiān 黃庭堅 at the earliest down to Wāng Zǎo 汪藻 (1079–1154) and Wáng Xuān 王宣 at the latest. Wú is identified by an internal entry, cross-referenced through Zēng Sānyì 曾三異’s Tónghuà lù 同話錄, with an episode about a minor clerk who rose by examination — the clerk is named there as Yú Zǐqīng 余子淸’s ancestor Yú Rénkuò 余仁廓 — placing Wú in the Sòng officialdom of the Shàoxīng era. CBDB has no record for him under this name.
His poetic affiliation, as the Sìkù tíyào notes, is to the Yuányòu circle of the late Northern Sòng (Sū Shì, Huáng Tíngjiān, Hè Zhù 賀鑄, and Chén Shīdào 陳師道), and his book carefully gathers anecdotes about them from oral tradition and from non-canonical sources. The Guānlín shīhuà is his sole surviving work.