Yuán-dynasty paleographer and seal-engraver, zì Zǐxíng 子行, hào Zhēnbái xiānshēng 貞白先生 (also Bùyī Dàorén 布衣道人), of Qiántáng 錢塘 (modern Hangzhou). Lame from childhood and deformed in body, he made a living as a private teacher and became a leading figure of late-Yuán scholarly seal-engraving. His monumental work, the Xuégǔbiān 學古編, is the foundational Chinese manual of paleographic seal-engraving and is repeatedly cited by the Sìkù compilers (e.g., in the tíyào on the Liùshū gù KR1j0034 for its severe critique of Dài Tóng’s 戴侗 paleography). The ZhōuQín kèshí shìyīn KR1j0038 of Zhìdà 1 (1308) is his critical revision of an earlier compendium of the same title by Yáng Wénbǐng (Sòng), now the canonical Yuán-period treatment of the Shígǔwén, ZǔChǔwén, and the Tàishān and Yìshān stelae. Death-year 1311 per traditional bibliographic sources; no CBDB entry can be confirmed under this name.