Atiśa

Atīśa (c. 982–1054) was a Buddhist religious leader and master. He is generally associated with his body of work authored at Vikramashila Monastery in Bihar, India. He was one of the major figures in the spread of 11th-century Mahayana and Vajrayana Buddhism in Asia, flowing from Tibet to Sumatra. He is recognised as one of the greatest figures of medieval Buddhism. Atiśa's chief disciple, Dromtön, was the founder of the Kadam school, one of the New Translation schools of Tibetan Buddhism, later supplanted by the Gelug tradition in the 14th century which adopted its teachings and absorbed its monasteries. Provided by Wikipedia