Tangut-period (Xī-Xià 西夏, 1038–1227) Esoteric Buddhist master, monk of Hù-guó Rén-wáng-sì 護國仁王寺 (“Country-Protecting King-of-Humanity Monastery”) — one of the principal imperial monasteries of the Tangut state. Recompiler (重集 zhòng-jí) of the Yú-jiā jí-yào yàn-kǒu shī-shí yí 瑜伽集要燄口施食儀 KR6j0761 (J19nB047), the Yàn-kǒu food-bestowal ritual recension that became the textual base of the Qing-period Tiāntái-school redaction by Shòu-dēng 受登. The Tangut empire under the Xià emperors (especially Rén-zōng 仁宗 / Rén-xiào 仁孝, r. 1139–1193) was a major site of Han-Tibet Buddhist exchange; Bù-dòng Jīn-gāng’s recompilation interpolated the Fó-dǐng zūn-shèng tuó-luó-ní 佛頂尊勝陀羅尼 (Buddha-Crown Victorious dhāraṇī) into the food-bestowal sequence as a vehicle for rebirth in Sukhāvatī, integrating elements of the Tibetan Tantric mortuary tradition into the Han-Chinese Yàn-kǒu liturgy.
Life-dates and native place are not recorded in extant sources; he is referred to in the Shòudēng recension only as Bùdòng shàngshī 不動上師 (“Master Bùdòng”). Not in DILA Buddhist Studies Person Authority. Not the same person as the deity Bùdòng Míngwáng 不動明王 (Acala, also called 不動金剛明王) — note the homonymy.
Source: colophon and editorial notes of Yújiā jíyào yànkǒu shīshí yí J19nB047 KR6j0761.