Athelstan (George Blagden)

Once a devout monk living a peaceful and humble life, Athelstan is spared by Ragnar after his monastery is pillaged by the Vikings. Although Ragnar initially took Athelstan captive as a slave, he treats him well and has befriended him. As he lives amongst the Vikings, Athelstan learns that their culture is shockingly different from the Christian religion, from their attitude to their gods, to sex, and to sacrifice.