Why does Grendel's mother attack Heorot?
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Beowulf
Beowulf preparing to cut off the head of the monster Grendel, illustration from Hero-Myths & Legends of the British Race, 1910.
In the Old English poem Beowulf, Grendel's mother attacks the mead hall of Heorot specifically to avenge the death of her son, Grendel, at the hands of the hero Beowulf.12
After Grendel is mortally wounded by Beowulf and retreats to his swamp to die, his mother—described as a swamp monster—arrives at Heorot while the warriors are sleeping. During this retaliatory strike, she kills one of King Hrothgar’s men. This act of vengeance aligns with the poem's broader thematic focus on the Germanic code of loyalty and the cycle of the blood feud, where retribution is a central motivation for the characters' actions.2