Beowulf is the greatest old English poem.He later becomes the king of the Geats, and he finds his realm terrorized by a dragon whose treasure had been stolen from his hoard in a burial mound.When a dragon begins to pose a threat to Geatland, he sets off to defeat it. He succeeds in slaying the dragon but is mortally wounded and died later.He comes to the aid of King Hrothgar, whose kingdom is being terrorized by a monster named Grendel.