King Hrothgar was the ruler of Herot, which was being terrorized by the monster Grendel. Grendel was killing and eating the people of Herot. This brought the hero Beowulf to Herot to defeat Grendel where others had failed. The section introduces the key characters of Grendel as the tormentor and Beowulf as the one strong enough to face Grendel and save Herot.