Berserk

Berserk is a Japanese manga series written and illustrated by Kentaro Miura. Set in a medieval Europe-inspired dark fantasy world, the story centers on the characters of Guts, a lone mercenary, and Griffith, the leader of a mercenary band called the “Band of the Hawk”. Miura premiered a prototype of Berserk in 1988.

https://en.wikipedia.org/wiki/Berserk_(manga)