The Song of Roland is a very well-known medieval epic poem based on the Battle of Roncevaux in 778. It inspired many subsequent writers, poets and musicians.
While browsing through YouTube this morning, I was intrigued to come across a Norwegian ballad, dating from about the 12th century, retelling the saga of Roland from a quasi-Viking perspective. It's in Norwegian, of course, but a translation has been provided as it plays. It's illustrated with medieval- and Renaissance-era portrayals of the battle. It's a rousing battle tune, well suited to the Vikings who would have sung it.
Now there's an interesting historical twist . . . a Viking interpretation of a medieval Christian fable! It's sung by the Trio Mediaeval as part of an entire album of Norwegian medieval folk songs. I think I'm going to have to buy it - it's cheap enough to be affordable, and if this song is anything to go by, it'll be interesting listening.