Jiǎ Gōngyàn 賈公彥 (fl. 650–655, floruit under Táng Gāozōng’s Yǒnghuī 永徽 reign), native of Yǒngnián 永年 in Míngzhōu 洺州 (modern Yǒngnián, Hébei). The principal Táng commentator on two of the Sānlǐ 三禮: he produced the standard sub-commentary (shū 疏) on Zhèng Xuán’s notes to the Zhōulǐ (incorporated in KR1d0003 Zhōulǐ zhùshū) and to the Yílǐ (incorporated in KR1d0028 Yílǐ zhùshū). Both works are core elements of the canonical Shísān jīng zhùshū 十三經注疏 corpus and remain the indispensable Táng layer of Three-Rites scholarship.
Jiǎ rose to Tàixué bóshì 太學博士 (Erudite of the Imperial Academy) under Táng Gāozōng. His biography is preserved in the Jiù Tángshū 舊唐書 Rúxué 儒學 chapter (juan 189A). Zhū Xī 朱熹 in his recorded sayings remarks that “of the zhèngyì on the Five Classics, the Zhōulǐ shū is the best” (五經疏中周禮疏最好), as cited in the Sìkù tíyào of KR1d0003. The Sìkù editors agreed that Jiǎ’s sub-commentary “is also exhaustively learned and substantial — it is sufficient to bring out and develop Zhèng’s learning.”
Jiǎ also wrote the prefatory essay Xù Zhōulǐ fèixīng 序周禮廢興 (preserved in KR1d0003), tracing the transmission history of the Zhōulǐ from Mǎ Róng 馬融’s account through the HànWèi controversies, the Liú Xīn provenance question, and the views of Lín Xiàocún 林孝存 and Hé Xiū 何休 — a foundational document for the early reception history of the text.