Drepung is one of the three major Geluk monasteries of Lhasa. It was founded in 1416 by Jamyang Choje Tashi Pelden, a disciple of Tsongkhapa. It contains the Ganden Podrang residence which served as the seat of the Dalai Lamas until the seventeenth century. The entire monastery was initially administered from the office of the Drepung Throne holder; since the time of the Fifth Dalai Lama the custom has been that the senior abbot of the two principle colleges, Gomang or Loseling, has served as head of Drepung. Of the seven colleges that were once part of the monastery, only four survive, the two others being the Ngakpa Dratsang and Deyang.