Mid-Táng phonologist, fl. Tiānbǎo era; bibliographic title Chénzhōu sīfǎ 陳州司法 (Director of Penal Cases at Chénzhōu). Almost nothing is known of his life beyond his phonological work. The compiler of the Tángyùn 唐韻 in Tiānbǎo 10 (751), a substantial expansion and re-issuing of Lù Fǎyán’s 陸法言 Qièyùn. The Tángyùn in turn is the text-historical ancestor of the Guǎngyùn — Cháo Gōngwǔ’s Jùnzhāi dúshūzhì and the Sòngshǐ Yìwén zhì both list “Lù Fǎyán Guǎngyùn 5 juàn” — i.e., the Tángyùn and Sòng-period Guǎngyùn lineage are formally continuous. Sūn Miǎn’s preface (preserved in the Sìkù Yuánběn Guǎngyùn KR1j0054) is the principal source for the Qièyùn / Tángyùn expansion history. The Tángyùn itself is lost; modern reconstructions (Zhōu Zǔmó 周祖謨’s Tángdài yùnshū kǎo, 1966) work from Dūnhuáng and Turfan fragments and from citation in the Guǎngyùn line. No CBDB entry. Not to be confused with the early-Sòng calligrapher 孫愐 (no relation).