Chéng Jù, zì Zhìdào 致道, was a native of Qúzhōu 衢州 in present Zhèjiāng. He served in a long series of Northern and early Southern Sòng court posts, including Editor in the Imperial Library (秘書郎), Drafter at the Bureau of Foreign Imperial Edicts (中書舍人), and most importantly Junior Director of the Imperial Library (祕書少監) under Gāozōng 高宗 in early Shàoxīng. In Shàoxīng 1 (1131) he memorialized for and authored the Líntái gùshì 麟臺故事 (KR2l0003), the foundational Sòng administrative monograph on the Imperial Library. He left a literary collection, Běishān jí 北山集 (also known as Běishān xiǎojí 北山小集; KR4d series), and was admired by his contemporaries as a careful prose stylist in the lineage of Wáng Anshí 王安石. Lifedates 1078–1144 confirmed in CBDB and Sòngshǐ 445.