A Heian-era Japanese Tendai monk-scholar and the principal late-9th-century systematizer of Japanese Tendai-Esoteric (Taimitsu 台密) doctrine and bibliography. Japanese name Annen 安然. Born 841 CE; died around 915 CE (death date not certain).
He was a Mount Hiei zazu-line successor to Ennin 圓仁 (the founder of Tendai-Esoteric integration) and the principal organizer of the post-nittō-hakke Heian Esoteric establishment. His doctrinal-bibliographic output systematized the dual-mandala lineage transmissions that the eight Tang-pilgrim Japanese monks had brought to Japan, establishing the canonical-organizational framework of Japanese Tendai-Esoteric study that has continued to the present.
His major works include:
- Zhū āshélí zhēnyán mìjiào bùlèi zǒnglù 諸阿闍梨真言密教部類總錄 (KR6s0124, T2176, 2 juan) — the foundational Heian Esoteric bibliographic-organizational compendium.
- Tàimì shíjiào 教時諍論 (4 juan) — Tendai-Esoteric doctrinal-temporal categorization treatise.
- Tàimì shēngshén qíyào shí 大日經疏 commentaries.
- And many other Tendai-Esoteric doctrinal and bibliographic works.
Source: KR6s0124; standard Japanese Tendai-Esoteric (Taimitsu) scholarly tradition.