Aro Dictionary

The Second Buddha, who—with his consort Yeshé Tsogyel—established Vajrayana Buddhism in Tibet in the Eighth Century. Padmasambhava and Yeshé Tsogyel are the central Tantric Buddhas of the Nyingma tradition. In Aro, all yidams are viewed as emanations of Padmasambhava or Yeshé Tsogyel.
The equivalent Tibetan term is Guru Rinpoche.