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 Zhōu-Qín 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, Zǔ-Chǔwén, and the Tàishān and Yìshān stelae. Death-year 1311 per traditional bibliographic sources; no CBDB entry can be confirmed under this name.