The moment
King Trisong Detsen brought the Indian scholar Śāntarakṣita and, tradition says, the tantric master Padmasambhava to build Tibet's first monastery, completed around 779, where the first Tibetans were ordained as monks. A few years later the court staged a debate between a Chinese Chan teacher and Śāntarakṣita's Indian pupil Kamalaśīla on sudden versus gradual awakening; Tibetan accounts say the king ruled for the Indian side.
People: Trisong Detsen, Śāntarakṣita, Padmasambhava, Kamalaśīla