In the Old English epic Beowulf, the Geatish hero travels to Denmark to aid King Hrothgar, whose great hall Heorot has been terrorized for 12 years by the monster Grendel.
Grendel, a descendant of Cain, attacks nightly, killing and devouring warriors. Danish attempts fail. Beowulf vows to fight unarmed—matching Grendel's lack of weapons. His victory establishes his legend and cements a Geatish-Danish alliance.
The poem frames this as the archetypal heroic journey: a warrior confronting chaos to restore order.