This entry covers practitioners of the Batak Traditional Religion, a system of practices that has been typically referred to as a traditional belief (aliran kepercayaan) by the Indonesian government as opposed to a formally recognized religion (agama). However, the Batak traditional religion has gone through various local iterations, focused on the worship of royalty as god, millenarianism, modern reforms, and a re-application of an appeal toward traditional cultural understandings. The traditional Batak religion is also often described as a form of Hinduism that is heavily localized, specific to the ethnic context of the Batak people, or Batak Hinduism.