Milarepa

Jetsun Milarepa (Tibetan: རྗེ་བཙུན་མི་ལ་རས་པ་, Wylie: rje btsun mi la ras pa, 1052-1135) 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.

Source: Wikipedia — https://en.wikipedia.org/wiki/Milarepa