Ragnar Lodbrok from this series is a fictitious character based on a fictitious character. Well the Ragnar Lodbrok from Ragnar's Saga is an aggregate of several real Norsemen. So the perfect character to build a series around. Since we know few actual Vikings in detail. Just push him into the past a few generations to have him be the anonymous Norseman who raided Lindisfarne.
Floki is nothing but a kooky man. Nothing supernatural about him. The most supernatural events in the show so far are Ragnar's visions of Odin. Which are pretty cool, and still believable. The company who produces this show also produces The Tudor's and The Borgias (a show I really enjoy).
And this is the show's theme song in it's entirety with some clips from later episodes. Where Ragnar and crew are fighting organized bands of Franks (I'm assuming since there are heavy cavalry) and Saxons.
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