The Great Perfection (rDzogs chen in Tibetan) is a philosophical and meditative teaching. Its inception is attributed to Vairocana, one of the first seven Tibetan Buddhist monks ordained at Samye in the eight century A.D. The doctrine is regarded among Buddhists as the core of the teachings adhered to by the Nyingmapa school whilst similarly it is held to be the fundamental teaching among the Bonpos, the non-Buddhist school in Tibet. After a historical introduction to Tibetan Buddhism and the Bon, the author deals with the legends of Vairocana (Part I), analysing early documents...