Lǐ Lóngjī 李隆基, the Xuánzōng 玄宗 emperor of Táng (r. 712–756), posthumous epithet Mínghuáng 明皇, is the seventh Táng emperor and — with Gāozōng and Wǔ Zétiān — the principal patron of Daoism in the dynasty. Under his long reign the Táng state-Daoist establishment reached its apogee: the Kāiyuán 開元 Dàozàng was compiled and promulgated, the Chóngxuán guǎn 崇玄館 system of state-sponsored Daoist abbeys was founded (743), and Sīmǎ Chéngzhēn 司馬承禎 became de facto court preceptor. Xuánzōng himself composed an imperial commentary on the Dàodé jīng (the Dàodé zhēnjīng zhù shū 道德真經註疏 complex), and his fēngshàn 封禪 rite on Tài shān 泰山 in 725 was the most elaborate of the Táng.
His reign ended in the catastrophe of the An Lushan rebellion (755–763), during which he fled to Shǔ. The Sòng-era Shàngfāng dàdòng zhēnyuán miàojīng pǐn KR5b0120 (DZ 436) falsely attributes its preface to him, conflating him with the Shàngfāng tiānzūn 上方天尊 on the basis of the shared epithet “Mínghuáng.”
Lacks CBDB record (imperial emperors are often omitted from CBDB). Dates from Jiù Táng shū 8 and Xīn Táng shū 5.