Nyingma tradition is the oldest of the four major schools of Tibetan Buddhism, it literally means “ancient,” and is often referred to as Ngangyur. Nyingma is an answer to the invitation of King Trisong Detsen that Padmasambhava came to Tibet around AD760. Together with Shantarakshita, Padmasambhava organized 108 translators spending years to translate large scriptural of Dharma-teachings to Tibet. The translations of this period formed the base of the development of Buddhism in the Tibetan plateau. During the same period, Padmasambhava created the Nyingma tradition, which is the oldest of the four major sects of Tibetan Buddhism.
Nyingma is translated as “ancient” in Tibetan and referred to as the “school of the ancient translations”. It was found on the first translations of Buddhist scriptures from Sanskrit into Tibetan in the 8th century.
There are six monasteries known as “mother monasteries” of the Nyingma lineage, which are as follows: Katok Monastery, Dorje Drak Monastery, Mindroling Monastery, Pelyul Monastery, Dzogchen Monastery, Shechen Monastery. Among those, 4 of Katok monastery, Palyul Monastery, Shechen Monastery, Dzogchen Monastery, are located in Derge county of the eastern tibet of Kham, which has made Kham the center of this lineage.