Scandinavian settlers brought Old Norse religion to Britain in the latter decades of the ninth century. Several British place-names indicate possible cultic sites; for instance, Roseberry Topping in North Yorkshire was known as Othensberg in the twelfth century, a name deriving from the Old Norse Óðinsberg (Hill of Óðin). Several place-names also contain Old Norse references to mythological entities, such as alfr, skratii, and troll. The English church found itself in need of conducting a new conversion process to Christianise this incoming population.