Only in medieval Iceland was a large amount of Germanic-language material written on the subject of pagan traditions, principally the mythological poems of the Poetic Edda, "Prose Edda", and skaldic verse. These works have enormous significance for our understanding of the ancient religious traditions. However, these sources were recorded after Christianity became dominant in Iceland by writers who themselves were Christians. Some traces of Germanic religion are preserved in other works by medieval Christians like the Middle High German "Nibelungenlied" and the Old English "Beowulf".