Nyingmapa

Nyingmapa("School of the Ancients") is the oldest of the Tibetan Buddhist schools and the second largest after Geluk. The Nyingma school is based primarily on the teachings of Padmasambhava, who is revered by the Nyingma school as the "second Buddha." Padmascambhava's system of Vajrayana or Tantric Buddhism was synthesized by Longchenpa in the 14th century. The distinctive doctrine of the Nyingma school is Dzogchen ("great perfection"), also known as ati-yoga (extraordinary yoga). It also makes wide use of shamanistic practices and local divinities borrowed from the indigenous, pre-Buddhist Bon religion. Nyingma monks are not generally required to be celibate.