Shamanism was the dominant religion of the Jurchen people of northeast Asia and of their descendants, the Manchu people. As early as the Jin dynasty (1115–1234), the Jurchens conducted shamanic ceremonies at shrines called tangse. There were two kinds of shamans: those who entered in a trance and let themselves be possessed by the spirits, and those who conducted regular sacrifices to heaven, to a clan's ancestors, or to the clan's protective spirits.