Tengyur

Where the Kangyur gathers texts held to be the Buddha's own words, the Tengyur, translation of treatises, gathers everything built on top of them: commentaries on individual sutras and tantras, independent philosophical treatises, and technical works on logic and epistemology (pramana), grammar, poetics, medicine and other subjects the great Indian Buddhist monastic universities such as Nalanda and Vikramashila treated as part of a complete education. The Tengyur is considerably larger than the Kangyur, running to over two hundred volumes in the standard editions, and it preserves the work of major Indian Buddhist philosophers including Nagarjuna, Vasubandhu, Dignaga and Dharmakirti in Tibetan translation, alongside original commentarial writing by Tibetan scholars themselves.

The collection reflects the scholastic, argument-driven monastic culture Tibetan Buddhism inherited from late first-millennium Indian Buddhist universities, transplanted and continued in Tibet after Buddhist institutional life in India itself declined following the twelfth and thirteenth centuries. Later Tibetan scholars added their own original commentarial writing to the collection over the centuries following Buton's initial sorting, meaning the Tengyur, unlike the Kangyur, continued to grow with genuinely new material even after its basic organizing structure was fixed in the fourteenth century.

The Tengyur took shape alongside the Kangyur in the same fourteenth century sorting project led by Buton Rinchen Drub, and the two were printed together at the same major monastic presses, Derge and Narthang among them, as companion halves of one canon. Its importance to modern scholarship goes beyond Tibetan Buddhism itself: the original Sanskrit texts behind many Tengyur works are lost entirely, destroyed or simply not copied forward through the centuries that followed the decline of Buddhist institutions in India, which means the Tibetan translation preserved in the Tengyur is sometimes the only surviving witness to what an Indian philosopher such as Dharmakirti actually argued.

Reconstructing lost strands of Indian Buddhist philosophy today depends in real, ongoing cases on working back from the Tengyur's Tibetan wording, making the collection a working research archive for historians of Indian thought as much as a canon read for its own tradition's religious purposes. That dependence runs in both directions: Tibetan scholars themselves have long used the Tengyur's preserved commentarial tradition to interpret the more compressed and difficult passages of the Kangyur's own sutras and tantras, treating the two collections as a single working reference library rather than as fully separable canons.