Southern-Sòng Neo-Confucian philosopher Zhū Xī 朱熹 (1130–1200), writing under the pseudonym Zōu Xīn 鄒訢 (“Kōngtóng Daoist,” Kōngtóng dàoshì 空同道士) for his Daoist-canon commentary work. The pseudonym’s key: during the Warring States, Zōu 鄒 was the name of a state earlier called Zhū 朱; and xīn 訢 is synonymous with xī 熹 — so Zōu Xīn decodes as Zhū Xī (cf. DZ 1001 Zhōuyì cāntóng qì 3.8a).
Under this pseudonym Zhū Xī produced two principal Daoist-text works preserved in the Daozang, both commentaries on key scriptures associated with the Kōngtóng 崆峒 mountain Daoist tradition:
- DZ 1001 Zhōuyì cāntóng qì 周易參同契 (commentary on the Cāntóng qì, edited by Huáng Ruìjié 黃瑞節).
- DZ 125 Huángdì yīnfú jīng zhùjiě (the Yīnfú jīng commentary, whose substance was actually authored by Zhū’s student Cài Yuándǐng 蔡元定 with Zhū’s revision, published 1305 by Huáng Ruìjié).
On Zhū Xī’s Daoist engagements see Daniel K. Gardner, Zhu Xi’s Reading of the Analects (Columbia, 2003); Conrad Schirokauer, “Chu Hsi as an Administrator,” in Thomas H. C. Lee ed., China’s Educational Heritage; and Fabrizio Pregadio, The Seal of the Unity of the Three (Golden Elixir Press, 2011), on the Zhū Xī Cāntóng qì edition. Zhū Xī is extensively documented in Sòng biographical sources, Sòng shǐ 429, and the CBDB (multiple entries).