Jiǎng Zhèngzǐ 蔣正子 (hào Quányú 全愚, “Completely Foolish”), late-Sòng / early-Yuán yímín 遺民 (loyalist) literatus. His native place, birth and death dates, and substantive career are unrecoverable: the Sìkù quánshū zǒngmù tíyào explicitly notes “bù zhī hé xǔ rén” 不知何許人 (“of what place he was is unknown”), and CBDB has no record under this name. The single secure datum is an internal sentence in his only surviving work, Shānfáng suíbǐ KR3l0080: “Yǔ fēnjiào Lìyáng” 余分教溧陽 (“I served as instructor at Lìyáng”), placing him in a low-ranking xuéguān 學官 (school-official) post at Lìyáng 溧陽 county (modern Jiāngsū, south bank of the Yángzǐ) in the late Southern Sòng. He uses the phrase Mùlíng zài yù 穆陵在御 (“when Mùlíng was on the throne”) of Sòng Lǐzōng 理宗 (r. 1224–1264), the loyalist circumlocution that names the fallen sovereign by his tomb in the Kuàijī hills — confirming that he was a Sòng man who survived into the Yuán. Internal references in the work to the Mùmiánān 木棉菴 murder of Jiǎ Sìdào 賈似道 (1275), the Yáshān 厓山 collapse (1279), and Mongol-period (Zhāng Píngzhāng 張平章) anecdotes about Yuán Hǎowèn 元好問 set his active span tentatively at c. 1250s — early 14th century. His sole surviving work KR3l0080 Shānfáng suíbǐ combines shīhuà with yímín anecdote and is preserved through the Sìkù and the Míng Bàihǎi 稗海 collectanea.