Milarepa

Jetsun Milarepa was a Tibetan siddha, who was famously known as a murderer when he was a young man, before turning to Buddhism and becoming a highly accomplished Buddhist disciple. He is generally considered one of Tibet's most famous yogis and spiritual poets, whose teachings are known among several schools of Tibetan Buddhism. He was a student of Marpa Lotsawa, and a major figure in the history of the Kagyu school of Tibetan Buddhism. He is also famous for the feat of climbing Mount Kailash.