Táng Zhòngyǒu 唐仲友 (1136–1188; CBDB id 10010), zì Yǔzhèng 與政, hào Yuèzhāi 悅齋, native of Jīnhuá 金華 in Wùzhōu 婺州 (mod. Zhèjiāng). Southern-Sòng jìnshì of Shàoxīng 1163 (his father Táng Yáofēng 唐堯封 was also jìnshì); he subsequently passed the bóxué hóngcí 博學宏詞 examination. He served as Mìshū shěng zhèngzì 秘書省正字, Zhe-zuò zuǒ láng 著作佐郎, then went out as Zhī Xìnzhōu 知信州 and Zhī Táizhōu 知臺州, and rose to Tījǔ Jiāngxī xíngyù 提舉江西刑獄. Xiàozōng 孝宗 thought highly of his talent.
At Táizhōu he was the target of Zhū Xī’s famous six-memorial impeachment campaign of 1182–1183 — the Táng Zhū jiāozòu 唐朱交奏 dispute — and was demoted. The details of that controversy (which centered on charges of personal misconduct involving the Táizhōu courtesan Yán Ruǐ 嚴蕊 and on factional politics around Chén Liàng 陳亮) are preserved in Zhōu Mì’s 周密 Qídōng yěyǔ 齊東野語. The Sòng shǐ, compiled under Dàoxué (neo-Confucian) editorial dominance, refused him a biography; the Sìkù editors explicitly try to rehabilitate him, citing Sòng Lián 宋濂’s supplementary biography and Wáng Xiàngzhī’s Yúdì jìshèng. He died at age 53; his Sìkù tíyào writer notes that he “did not exhaust one-hundredth of what he had accumulated”.
Táng Zhòngyǒu was the leading Southern-Sòng exponent of the jīngzhì 經制 (institutional-systems) school of statecraft, grounded in close study of the Zhōu lǐ 周禮 and the zhèngshǐ institutional monographs. His principal surviving works are the Dìwáng jīngshì túpǔ 帝王經世圖譜 (KR3k0019), the Liùjīng jiě 六經解, the Jiǔjīng fātí 九經發題, Zhūjīng zòngzhǐ 諸經總旨, and the Yùzhāi túshū yuányùn 悅齋圖書淵運. He stood for an institutional-systems approach to statecraft different from Zhū Xī’s Dàoxué synthesis; modern Chinese intellectual historiography has revisited his work as a serious independent strand in Southern-Sòng thought.