Longchenpa (1308–1364), also known as Longchen Rabjam, was one of the most important and influential masters of the Nyingma school of Tibetan Buddhism. He is best known for his profound teachings on Dzogchen (the Great Perfection), a tradition emphasizing the natural, primordial state of mind. He synthesized and systematized earlier Dzogchen teachings, leaving behind a vast body of writings—especially the Seven Treasuries—that remain foundational to the tradition.