Tsang Tön Dorje Gyaltsen
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Also known as Rahula-gupta, Rahula-bhadra and Rahula-guhya-vajra (10/11th century).
An Indian Mahasiddha who was a teacher to both the great Atisha as well as the founder of the Shangpa Kagyu school, Khedrub Khyungpo Naljor. He is also known by the nickname of "the Yogin of the Black Mountain".