Dromton, Gyalwai Jungne (1005-1064 A.D.) the most famous Tibetan student of Lord Atisha and also the founder of Reting Monastery.
This painting is likely from a set of paintings illustrating the pre-incarnations of the Dalai Lama lineage.
Jeff Watt 2-2004
Thematic Set Teacher: Dromtonpa (lama)