Xǔ Yǐ 許顗 (fl. ca. 1110–1130), zì Yànzhōu 彥周, native of Xiāngyì 襄邑 (modern Suīxiàn 睢縣, Hénán). The Sìkù editors of his Yànzhōu shīhuà KR4i0014 note that the beginning and end of his career are otherwise unknown: the principal external reference point for dating is the book itself, where he records “in Xuānhé guǐmǎo (1123) I roamed Sōngshān 嵩山”, placing him alive and active just three years before Jiànyán 1; he had presumably entered the Southern Sòng. He was on close terms with the monk-poet Huìhóng 惠洪 (Juéfàn Huìhóng 覺範惠洪, 1071–1128), whose Lěngzhāi yèhuà 冷齋夜話 records Xǔ’s anecdotes and corrections, and whose company Xǔ kept “for the whole year” in Chángshā 長沙 (according to his own shīhuà). He was a follower of the Yuányòu 元祐 literary school — that is, the line of Sū Shì 蘇軾, Huáng Tíngjiān 黃庭堅, and Chén Shīdào 陳師道 — and his critical citations track that lineage closely.
No CBDB lifedates (id 11976, dates 0/0). No major modern biography.
His one surviving work is the Yànzhōu shīhuà 彥周詩話 KR4i0014, a single-juǎn shīhuà of considerable critical sophistication. The Sìkù editors single him out as “in the shīhuà of the Sòng, still a good edition” (zài Sòngrén shīhuà zhī zhōng, yóu shàn běn yě), a notably generous judgment.