Sū Yòu 蘇祐 (1492–1571; CBDB id 133576), courtesy name Yǔnjí 允吉, was a native of Línqīng 臨清, Shāndōng. He passed the jìnshì 進士 examination and had a distinguished official career under the Jiājìng 嘉靖 emperor, serving in censorate and surveillance positions. He is recorded in the Míng rén zhuànjì zīliào suǒyǐn 明人傳記資料索引 (page 943). His most notable posting relevant to his literary legacy was as Surveillance Commissioner (xúnàn yùshǐ 巡按御史) for Xuān-Dà (Xuānhuà 宣化 and Dàtóng 大同), where he was directly involved in the suppression of the 1553 military mutiny at Dàtóng — the events documented in his KR4k0083 Yúnzhōng Shìjì 雲中事記. He is also known for literary and poetic works. Sū Yòu’s firsthand account of the Dàtóng crisis provides a rare official participant-observer perspective on the chronic instability of the northern frontier during the Jiājìng period.