Vinland Saga
ヴィンランド・サガ
Thorfinn is the son to one of the Viking's greatest warriors, but when his father is killed in battle by the mercenary leader Askeladd, he swears his intent to have revenge. Thorfinn joins Askeladd's group in order to challenge him to a duel and ends up caught in the middle of a war for the crown of England.
(Source: Anime News Network)