Vinland Saga, Bestiarius Recommendations
Both have historical settings. Vinland Saga deals with Vikings while Toujuushi Bestialius (thta's quite a mouthful to pronounce) deals with Romans
In both titles a certain Japanese touch is added to very western ideas. In Vinland Saga there are warriors with superhuman strength while the other has a wyvern and several other demi-humans
Both contains bloody violent scenes
Both titles' main characters' have their fathers killed and they develop a complex "Master and Student" relationship with their fathers' murderers'