Chén Zétōng 陳則通 (lifedates not preserved), known by his style Tiěshān xiānshēng 鐵山先生, native place not preserved. The Sìkù tíyào notes that Zhū Yízūn’s 朱彝尊 Jīngyì kǎo 經義考 lists him between Liú Zhuāngsūn 劉莊孫 and Wáng Shēnzǐ 王申子, securely placing him in the early Yuán dynasty. His only surviving work is the Chūnqiū tígāng 春秋提綱 KR1e0058, for which Hú Guāngshì 胡光世 of Yújiāng 旴江 (Jiāngxī) wrote a 1306 preface (the dàbǐ zhī suì xià sìyuè bǐngxū date in Hú’s preface points to Tàidìng 3 (1326), the year of a dàbǐ national examination). CBDB person 108228 (Yuán) carries no further detail.