Bon is an indigenous religion of Tibet. Originally, Bon were a group of non-Buddhist ritual specialists in the court of the Tibetan emperors. From the eleventh century onward, an organized religion called Yungdrung Bon, or “Eternal Bon,” took shape. Yungdrung Bon developed in dialogue with Buddhism, incorporating deities called buddhas, scriptures modeled on the Buddhist canon, monks, and the establishment of monasteries. Followers of Yungdrung Bon trace their own origins to a founder called Tonpa Shenrab, who arrived from the semi-mythical land of Zhangzhung in western Tibet. The word “Bon” can also refer to the many non-organized indigenous religious practices, including the worship of mountain deities and making namkha. A follower of Bon is called a Bonpo.