The Drepung Monastery, one of the "Three Greatest Monasteries" (the other two are the Ganden Monastery and the Sera Monastery), was built in 1416 by Gyavang Chugve, the disciple of Master Zongkaba. Covering an area of 250,000 square meters, it is the biggest monastery in size and built in the style of Tibetan religious constructions. When the temple was first built, there was only one building, but more were built as time passed. The founder maintained the monastery for 32 years and taught discourses on the Three Baskets. From this, many monks gathered there to live and finally divided themselves into seven groups, forming seven colleges.
Due to the large increase in monks, the monastery became one of the greatest in Tibet. Later, 3 of the colleges combined with the others, and then, only four remained. Each college has an abbot responsible for every aspect of the college. The first line of Dalai Lamas received teachings at Drepung Monastery and the second through fifth Dalai Lamas made their home here. This monastery was so important that the name of the Tibetan government derives from the name of the residence at Drepung. After the fifth Dalai Lama, the subsequent ones were only temporal religious ruler, because the no longer had their permanent residence at the monastery.