Heathenry is the reconstructed practice of ancient Northern European religion. Heathens devote themselves to the Norse gods and view the Icelandic Eddas and sagas (originally oral poems recorded in the 13th century) as sacred texts. Ásatrú is one of the better-known types of Heathen religion. For some Heathens, the historical accuracy of their religion is very important; others believe that innovations are necessary to keep the religion relevant to the modern world.