In Old Norse, seiðr (sometimes anglicized as seidhr, seidh, seidr, seithr, seith, or seid) was a type of magic practiced in Norse society during the Late Scandinavian Iron Age. The practice of seiðr is believed to be a form of magic relating to both the telling and shaping of the future. Connected with Norse religion, its origins are largely unknown, although it became gradually eroded following the Christianization of Scandinavia. Accounts of seiðr later made it into sagas and other literary sources, while further evidence has been unearthed by archaeologists. Various scholars have debated the nature of seiðr, some arguing that it was shamanic in context, involving visionary journeys by its practitioners.