I'm watching the loosely accurate TV show Vikings. When Vikings pillage the Briton monastery of Lindisfarne, they also capture some monks as slaves. Later, one of the monks assimilates pretty well to the Norsemen society. He becomes one of the Vikings, and teaches them Anglo-Saxon language and Christian culture.
I know it's just a TV show and their main purpose is box-office. But could this story happen in real life? Did the Vikings, Huns or Teutons capture other kingdom's (preferably) priests or monks utilizing their unique knowledge and assimilate these people? Or the whole question is just too far-fetched?
If you know any sources, please share it.