Longchenpa

Longchenpa alias Longchen Rabjam (klong chen pa), (klong chen rab 'byams). (1308-1363) An incarnation of Princess Pema Sal, the daughter of King Trisong Deutsen, to whom Guru Rinpoche had entrusted his own lineage of Dzogchen known as Khandro Nyingtig. He is single-handedly regarded as the most important writer on Dzogchen teachings. His works include the Seven Great Treasuries, the Three Trilogies and his commentaries in the Nyingtig Yabshi. Longchenpa means 'Great expanse.'

reference

A more detailed account of his life and teachings is found in Buddha Mind by Tulku Thondup Rinpoche (Snow Lion Publications), 1989.