one of the "great three" Gelukpa university monasteries in Tibet. The other two are Ganden and Sera. Drepung is the largest of all Tibetan monasteries, and indeed at its peak was the largest monastery of any religion in the world. It was founded in 1416 by Jamyang Chojey, a direct disciple of Je Tsongkhapa, the founder of the Gelukpa school. It is located on the Gambo Utse mountain, 5 kilometers from the western suburb of Lhasa. At its largest, before the Chinese invasion of Tibet in 1959, the monastery housed fifteen thousand celibate monks. It was known for the high standards of its academic study, and was called the "Nalanda" of Tibet, a reference to the great Buddhist monastic university of Nalanda.