NĀ RO PA (1016–1100), also known as Nāḍapāda and Nāroṭapa; one of the eighty-four Indian Vajrayāna mahā-siddhas ("completely perfected ones"). Nā ro pa was the chief disciple of the siddha Ti lo pa (988–1069) and the second human member of the Vajrayāna lineage. This lineage runs from the celestial Buddha Vajradhāra to Ti lo pa, thence to Nā ro pa and his Tibetan disciple Mar pa (1012–1096), and then to the Tibetan Mi la ras pa (1040–1123), with whom the Bka' brgyud pa, one of the four major schools of Tibetan Buddhism, properly begins. Although the Bka' brgyud pa lays special claim to Nā ro pa, he is highly regarded throughout Tibet; in fact, most of the major Tibetan schools have over the course of time integrated his major transmissions and teachings into their own doctrinal formulations...