You couldn't make it up. BBC reports that Sweden has discovered its always been a Muslim country.

Why did Vikings have 'Allah' on clothes?

New Swedish research on Viking funeral clothes raises questions about Islam's influence in Scandinavia.
Write a comment …
Vikings plundered expensive things across Europe... couldn't it just be possible that these were just things that they stole from somewhere?

I think there have been things found in the Vatican that had Arabic writing on it. Muslim textiles were some of the best in the world during the middle ages.