Filipino shamans, commonly known as babaylan (also balian or katalonan, among many other names), were shamans of the various ethnic groups of the pre-colonial Philippine islands. These shamans specialized in communicating, appeasing, or harnessing the spirits of the dead and the spirits of nature. Babaylan were predominantly women serving in spiritual leadership roles; in rare instances, effeminate men (asog or bayok) adopted dress and roles commonly associated with women within indigenous spiritual practice. They were believed to have spirit guides, by which they could contact and interact with the spirits and deities (anito or diwata) and the spirit world. Their primary role were as mediums during pag-anito séance rituals. There were also various subtypes of babaylan specializing in the arts of healing and herbalism, divination, and sorcery.