Askeladd is a direct descendant of King Arthur. This is a series where the mangakaDID do the research, and yet the main character is practically a Viking Ninja. It's got Vikings hauling their ships across dry land to assault a fortress in the opening chapters; the legendary King Canute starts off as a shelteredpretty boy, then Took a Level in Badass and calmed The Berserker with sheer charisma. The berserker achieves that state via hallucinogenic mushrooms. And then there's Thorkell the Tall, a Boisterous Bruiser who is completely insane even by Viking standards, sinks ships by tossing logs at them and kills a charging horse with one punch. One. Punch.