Xiàng Ānshì 項安世 (1146–1208), zì Píngfǔ 平甫, hào Píngān 平菴, of Sōngyáng 松陽 in Chùzhōu 處州 (modern Sōngyáng county, southern Zhèjiāng). Tóng jìnshì chūshēn (tóngjìnshì, “associate of jìnshì”) of Chúnxī 2 (1175). Held Xiàoshū láng 校書郎 (Mìshūshěng 秘書省 / Imperial Library compiler) from Shàoxī 5 (1194); Tōngpàn 通判 (Vice-Prefect) of Chízhōu 池州 (added-allotment) from Qìngyuán 1 (1195); rose finally to Tàifǔ qīng 太府卿.
In Qìngyuán 2 (1196) he was caught in the Qìngyuán dǎngjìn 慶元黨禁 (“False-Learning Proscription”), removed from office, and demoted to live at Jiānglíng 江陵 (modern Húběi). He shut his door (dùmén bù chū 杜門不出), and during this period composed expositions on all the canonical Classics; his Yì commentary alone — the Zhōuyì wán cí — was completed as a whole book. The Wán cí’s auto-preface is dated Qìngyuán 4 / wùwǔ (1198) ninth month; the work was substantively revised by Jiātài 2 / rénxū (1202) autumn.
Biography in Sòngshǐ; further references in Guǎngé xùlù 館閣續錄 (capital-archive records) and Chén Zhènsūn’s Shūlù jiětí 書錄解題. Listed as Sōngyáng jìnshì in the Zhèjiāng tōngzhì 浙江通志 126.12b (per CBDB). CBDB id 18449.
Maintained a substantial correspondence with Zhū Xī (six or seven letters, on the report of Yú Jí’s preface), in which Zhū Xī communicated to him the famous Chéngzǐ formula Hányǎng xū yòng jìng, jìn xué zé zài zhì zhī 涵養須用敬，進學則在致知 (“self-cultivation must use reverent attentiveness; advancement in learning lies in the extending of knowledge”). Zhū Xī died in 1200, between Xiàng Ānshì’s first composition of the Wán cí (1198) and the final revision (1202).
Within the Kanripo corpus he is the author of KR1a0038 Zhōuyì wán cí 周易玩辭 (16 juan); a separately registered Xiàngshì jiāshuō 項氏家説, recovered in the Sìkù from Yǒnglè dàdiǎn citations, also bears his Yì-thought.