Answer and Explanation:
Grendel and Hrothgar are characters in the famous epic poem "Beowulf". Grendel is described as a man-eating monster and as a descendant of Cain. As we know, according to the Bible, Cain was the first man to ever commit murder. For that reason, Cain was cursed by God.
Hrothgar, on the other hand, has a connection with God. As the king, Hrothgar was chosen by God - it is believed across several cultures that the king and queen of a country are God's descendants or representatives. That is why Grendel cannot attach his throne. The glorious throne is also protected by God, and Grendel, as a descendant of Cain, is a cursed creature.