Pema Lingpa
Pema Lingpa (1346–1405), Sangye Lingpa (1340–1396) and Ratna Lingpa (1403–1479). Another key figure was Karma Lingpa (1326–1386), who wrote down an important work called "Profound Dharma of Self-Liberation through the Intention of the Peaceful and Wrathful Ones" which includes the two texts of the "bar-do thos-grol", the "Tibetan Book of the Dead".