Lǐ Dǐngzuò 李鼎祚
Mid-Táng Yì scholar, native of Zī zhōu 資州 (modern Zī zhōng 資中, Sìchuān). Active in the second half of the eighth century — post-755 (the An Lushan rebellion), since his work is absent from the Jiù Tángshū jīngjí zhì, which records up to high-Kāiyuán prosperity. Held the office of Bìshū shěng zhùzuòláng 祕書省著作郎 (“Director of Compositions” in the Imperial Library) — the only office attested in his own preface signature; not in the Tángshū liè zhuàn. Zhū Mùwēng’s 1557 preface to the Jíjiě additionally calls him Bìgé xuéshì 祕閣學士, on unknown authority. Yuán Jué’s 袁桷 Qīngróng jūshì jí 清容居士集 (Yuán) records a “Dǐngzuò Reading Terrace” (Dǐngzuò dúshū tái 鼎祚讀書臺) at Zī zhōu, the source for the native-place identification.
His one surviving work is the seventeen-juan Zhōuyì jíjiě 周易集解 (KR1a0008) — the foundational Táng anthology of pre-Táng Yì commentary, programmatically restoring the xiàngshù tradition against the yìlǐ monopoly of the early-Táng zhèngyì (KR1a0007). Lǐ’s own preface declares the work’s mission as kān Fǔsì zhī yěwén, bǔ Kāngchéng zhī yìxiàng 刋輔嗣之野文，補康成之逸象 — “to prune Wáng Bì’s wild words and supply what is missing from Zhèng Xuán’s images.” A separate companion volume, Suǒyǐn 索隱 in six juan, is mentioned in his own preface but was already lost by the early Sòng.
Almost the entire surviving fragmentary corpus of Hàn xiàngshù Yì (Mèng Xǐ 孟喜, Jiāo Yánshòu 焦延壽, Jīng Fáng 京房, Mǎ Róng 馬融, Xún Shuǎng 荀爽, Zhèng Xuán 鄭玄, Yú Fān 虞翻, Lù Jì 陸績) reaches us via Lǐ’s compilation; in this sense he is one of the most consequential preservers in the entire medieval canonical tradition.