Drepung Ngakpa Dratsang, the tantric college of Drepung Monastery, is one of four surviving colleges of the monastery. It was founded in 1419, and may have even existed before Drepung monastery. Following studies at Drepung Ngakpa Dratsang, students would continue at Gyuto or Gyume, both located in Lhasa city. One of the college's temples contains relics of Ra Lotsāwa.
Akester, Matthew. 2016. Jamyang Khyentse Wangpo's Guide to Central Tibet. Chicago, IL: Serindia Publications, pp. 112-113.
Gyurme Dorje. 2009. Tibet Handbook. Bath: Footprint, pp. 130-131.
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The TBRC RID number refers to the unique ID assigned by the Tibetan Buddhist Resource Center (TBRC.org) to each historical figure in their database of Tibetan literature.