It was mainly due to Gendun Drup's energy and ability that Tsongkhapa's new school grew into an expanding order capable of competing with others on an equal footing. Taking advantage of good relations with the nobility and a lack of determined opposition from rival orders, on the very edge of Karma Kagyu-dominated territory he founded Tashilhunpo Monastery at Shigatse. He was based there, as its Abbot, from its founding in 1447 until his death. Tashilhunpo, 'Mountain of Blessings', became the fourth great Gelugpa monastery in Tibet, after Ganden, Drepung and Sera had all been founded in Tsongkhapa's time. It later became the seat of the Panchen Lamas.