Southern-Sòng xiǎoxué scholar and minor official, zì Yànsī 彥思 (or Yànzhān 彥瞻 in his preface), hào Yǒngzhāi 泳齋. Self-styled as a man of Dàijùn 代郡 (an old place-name then under Jīn rule) — i.e., the family ancestral place — but actually a Southern-Sòng official: under Chúnyòu (1241–1252), he served as Gōngbù láng and was Qúzhōu shǒu (Prefect of Qúzhōu). His one surviving xiǎoxué work is the Jiǔjīng bǔyùn 九經補韻 KR1j0063 (1 juàn, prefaced Jiādìng 17 / 1224 / jǐwàng of the 10th month) — an attempt to supplement the official Lǐbù yùnlüè with c. 79 graphs from the Nine Classics not covered in the official rhyme-book, plus 88 additional graphs avoided by the yùnlüè on grounds of sàngzhì (mourning-rite associations) or yīnyìfúshùn (irregular reading). The author’s preface explicitly states the supplement is for private use, not official petition. CBDB cbdbId 409354 has no firm lifedates.