Vinland Saga

The story follows Thorfinn, a young Icelandic boy who grows up hearing tales from explorer Leif Erikson about Vinland- a warm, fertile, peaceful land far across the western sea where there is no war or slavery.
Thorfinn's peaceful childhood ends when a mercenary leader named Askeladd orchestrates an ambush that kills Thors, Thorfinn’s father (a legendary former warrior known as the "Troll of Jom"). Consumed by grief and hatred, young Thorfinn joins Askeladd's mercenary band, living on the battlefield and waiting for the chance to duel and kill Askeladd in honorable vengeance.