Bön-Po – A Tibetan form of Buddhism that is likely to have originated as a pre-Buddhist animism with shamanic leaders. Some interpreters try to maintain a distinction between Bön and Buddhism, but this ignores both Tibetan self-understandings and many centuries of history. The integration of pre-Buddhist cosmologies, practices, and performances is said to explain the importance of exorcism in Tibetan Mahayana Buddhism.
SOURCE:
Historical Dictionary of Shamanism by Graham Harvey and Robert J. Wallis 2007