Late-Sòng / early-Yuán scholar of Shānyīn 山陰 (Shàoxīng, Zhèjiāng), zì Shòuzhī 受之. A jìnshì of the late Southern Sòng (Xiánchún 咸淳 1, 1265, in some sources), he served as instructor (xuélù 學錄) and later academician of the Shàoxīng prefectural school under the Yuán; he refused office at the Yuán court and devoted his later years to philological work. His most famous and durable contribution is the yīnzhù 音註 (annotation with phonetic glosses and historical notes) to the Wú Yuè Chūnqiū KR2i0001, printed in Dàdé 大德 10 (1306) at the Shàoxīnglù Confucian School. His preface, dated Dàdé 10, gives his name as 徐天祜 in the original printing — the form 徐天祐 is the modernized variant; both are valid (the two graphs are readily confused). His commentary, in the manner of Liú Xiàobiāo’s 劉孝標 commentary on the Shìshuō xīnyǔ 世說新語, supplies textual variants from the Hàn histories, the Guóyǔ 國語, and other early sources, and remains the standard apparatus for the Wú Yuè Chūnqiū. CBDB id 46273 carries no dates.