For killing this figure, 
For killing this figure, Wealhtheow gives a hero three horses, while in John Gardner's retelling of this figure's story, he spares Wealhtheow's life when her husband won't protect her. The Nowell Codex describes this figure as a descendant of Cain. Considered a cannibal giant by the denizens of Heorot, his slayer later ventures into this figure's namesake "mere," a lake, in which he kills this figure's unnamed mother. FTP, name the first antagonist in Beowulf.
For killing this figure, Wealhtheow gives a hero three horses, while in John Gardner's retelling of this figure's story, he spares Wealhtheow's life when her husband won't protect her.
Grendel