Sīmǎ Chéngzhēn 司馬承禎 (zì Zǐwēi 子微; hào Báiyún zǐ 白雲子; posthumous sobriquet Zhēnyī xiānshēng 貞一先生; 647–735) was the twelfth patriarch of the Shàngqīng 上清 Máoshān 茅山 lineage and the most influential Daoist master of the early Táng. A descendant of the Sīmǎ imperial line of the Jìn, he received the transmission from Pān Shīzhēng 潘師正, the eleventh patriarch, at Sōngshān 嵩山 before retiring to Tiāntái shān 天台山 at its Báiyún guàn 白雲觀 — whence his hào.
He was summoned to court by three successive Táng emperors — Wǔ Zétiān 武則天 (r. 690–705), Ruìzōng 睿宗 (r. 710–712), and especially Xuánzōng 玄宗 (r. 712–756), who built for him the Yángtái guàn 陽臺觀 on Wángwū shān 王屋山 in 721. Under Xuánzōng’s patronage he became the dominant voice in the Táng state’s Daoist establishment; he authenticated imperial sacrificial protocols, supplied the kēyí 科儀 for imperial fēngshàn 封禪 rites, and produced the standard Táng doctrinal framework for interior cultivation.
His principal surviving works in the Daozang include:
- Zuòwàng lùn 坐忘論 (DZ 1036) — the canonical Táng exposition of “seated oblivion” meditation, in seven steps.
- Tiān yǐnzǐ 天隱子 (DZ 1020) — a short treatise on the path to immortality.
- Fúqì jīngyì lùn 服氣精義論 (DZ 830) — on qì-absorption.
- Shàngqīng hánxiàng jiànjiàn tú 上清含象劍鑑圖 KR5b0115 (DZ 431) — attributed, on Daoist magic mirrors and swords, presented to Emperor Xuánzōng.
- Tiāndì gōng fǔ tú 天地宮府圖 (on the Daoist topography of the Ten Great Grotto-Heavens and Thirty-six Minor Grotto-Heavens), preserved in Yúnjí qīqiān 27.
Standard studies: Livia Kohn, Seven Steps to the Tao: Sima Chengzhen’s Zuowang lun (Nettetal, 1987); Barrett, Taoism Under the T’ang.