Sri Singha

He was a principal student and dharma-son of Mañjuśrīmitra in the Dzogchen lineage, and is credited by the Nyingma school with introducing Dzogchen to Tibet.According to the Nyingmapa tradition of Tibetan Buddhism, the Dzogchen masters Manjushrimitra and Shrisimha were already active in the Tantric milieu in India independently. However, Manjushrimitra, a learned scholar of Brahman origin, was evidently an adherent of the Yogachara school before his becoming a disciple of the mysterious Prahevajra or Garab Dorje from the country of Uddiyana. It should also be recalled that his disciple Shrisimha was said to have been born and resided for some time in China before coming to India. And that the latter's disciple Vimalamitra visited China before and after he came to Tibet and transmitted the Dzogchen teachings to his disciples at Samye Monastery.