I'm not even saying this is like the sopranos/boardwalk empire or anything like that.
But, if you listen to this guy
http://www.dancarlin.com/disp.php/hh
talk about how Vikings are a lot like modern day bikers, w/many examples.
Then combine that w/ me thinking it was a 9 part documentary, and not a drama set in ancient times, that is ALL I'm saying.
But, BS if that main guy isn't trying to be Jax. Same mannerisms, same smile.