Gōng Yízhèng 龔頤正
Zì Yǎngzhèng 養正. Originally named Gōng Dūnyí 龔敦頤; renamed Yízhèng 頤正 at the accession of Sòng Guāngzōng (1189) to avoid the imperial taboo on the homophonous personal name Dūn 惇 of the future Níngzōng (Zhào Dūn 趙惇 was Guāngzōng’s personal name, observed under the bìhuì 避諱 system). Native of Suìchāng 遂昌 in Chǔzhōu 處州 (modern Zhèjiāng). CBDB id 10189; the database (drawing on the Sūzhōu fǔzhì 蘇州府志, 78.16a, and the Sòngrén zhuànjì zīliào index) gives no precise lifedates; his floruit is securely 1187–1201, and he died after the latter date.
Held the post of Jiǎntǎoguān 檢討官 in the Guóshǐyuàn 國史院 (“Reviser-Examiner of the Bureau of National History”) under Guāngzōng and Níngzōng. Hán Yuánjí 韓元吉’s Nánjiàn jiǎyǐ gǎo 南澗甲乙稿 contains a poem titled “Tí Jièyǐn” 題芥隱 (“Inscribed for the Mustard-Hidden Studio”), composed for Yízhèng — confirming that Jièyǐn was the name of his studio, whence the title of his sole surviving substantial work, Jièyǐn bǐjì 芥隠筆記 (KR3j0043). The Sìkù editors esteem the Jièyǐn bǐjì as standing comparison with Shěn Kuò’s 沈括 Mèngxī bǐtán 夢溪筆談 and Hóng Mài’s 洪邁 Róngzhāi suíbǐ 容齋隨筆.