Cài Zhèngsūn 蔡正孫 (b. 1239, fl. 1270s–1290s), zì Cuìrán 粹然, self-styled Méngzhāi yěyì 蒙齋野逸 (“Hidden-Idler of the Méng Studio”). A Southern Sòng yímín and a close follower of Xiè Fǎngdé 謝枋得 (1226–1289), the well-known Sòng loyalist martyr (Xiè starved himself rather than serve the Yuán). Cài’s name appears in the appendix to the Xiè Diéshān jí 謝疊山集 as the author of a parting poem for his teacher. After the fall of the Sòng he refused all official service under the Yuán and devoted himself to private compilation. His principal work, the Shīlín guǎng jì 詩林廣記 (KR4i0045), is dated by its self-preface to the yǐchǒu 已丑 year — which, given his connection with Xiè Fǎngdé and the work’s internal evidence (Xióng Hé 熊禾 is quoted), the Sìkù editors fix as Yuán Zhìyuán 至元 26 (1289), exactly thirteen (the editors say “ten”) years after the fall of the Sòng. He deliberately omits the Yuán reign-title from his preface — following Táo Qián’s 陶潛 post-Jìn precedent of dating in the cyclical gānzhī alone — and so signals his loyalist stance. The Yuán Shīlín guǎng jì preface contains the famous self-description: “After my world was overturned and the smoke of war cleared, I cast aside my civil-examination training and could finally indulge my mind in the poetry of the various schools.” CBDB id 51612 records him with a flourit date of 1270–1278.