The grandson of Scyld was Hrothgar (whose name becomes Roger in later times), and Hrothgar was a Danish king, builder of Heorot, a princely hall. His happiness awoke the envy of Grendel, a fiend of the wilds.
The Christian author of the poem, as it stands, thinks that Grendel and other monsters are descendants of Cain!
The nobles slept in the great hall, whither Grendel came and caught away thirty of them. Men sought other sleeping-rooms, but Grendel still came and slew them. The house was empty, and men promised sacrifices to their false gods all in vain: "they knew not the true God," yet the poet often forgets their ignorance, and makes them speak like Christians:
There was a king of Gothland named Hygelac, a real king living at the beginning of the sixth century. The king's nephew, Beowulf, heard of the evil deeds of Grendel, and set sail with some of Hygelac's men to help the unhappy Hrothgar. They all wore shirts of mail made curiously of interlaced iron rings, they had spears with iron heads, and helmets crowned with the figure of a boar made in iron; some of these shirts of chain-mail and helmets still exist. Coming into the great hall, built of timber plated with gold, the heroes explained their errand, and were well received. As Grendel cannot be harmed with stroke of steel, Beowulf will carry neither sword nor shield, but be slain by Grendel; or slay him with his hands. If Grendel eats him, Hrothgar will not need to give him due burial—burning his body, and burying the bones in a mound of earth; the custom is that of the unconverted German tribes. Hrothgar accepts the offer, the warriors sit at their ale (they had not much wine), and listen to the clear voice of the minstrel as he sings of old adventures. But Hunferth, a thane of Hrothgar, out of jealousy, taunts Beowulf with having been beaten in a swimming match that lasted for seven nights. Beowulf replies that Hunferth "has drunk too much beer": he himself swam better than his opponent for five nights, and slew nine sea-monsters with his sword; Hunferth, on they other hand, dare not face Grendel, and has been the destroyer of his own brothers. Yet Hunferth does not draw his sword, after these insults, which is strange; and the feast in hall goes on merrily.
Such scenes of boasting and quarrelling were, no doubt, common over the ale cups, but Waltheow, Queen of Hrothgar, "the golden-garlanded lady, the peace-weaver," enters the throng, and bears the cup of welcome to Beowulf, thanking God that she has found a helper to her heart's desire. Then she takes her place by her lord Hrothgar.
Night fell, Beowulf, committing himself "to the all-knowing God," takes off his armour and lays his head on the bolster—the word is the same in Anglo-Saxon. Grendel arrived, burst in the iron-bolted door, and laughed as he saw the sleeping men. One warrior he tore to pieces and devoured; but Beowulf, who had the strength of thirty, gripped the fiend, and the hall echoed with their wrestling and stamping up and down; the clamped benches were torn from the floor. Men smote at Grendel with swords, but the steel did not bite on his body. Beowulf tore his arm and shoulder clean away, and Grendel, flying to a haunted pool, described as a terrible place, dived down through the bloodstained water, and "hell caught hold of him".
In Heorot men now made merry, and the minstrel sang a new song of the fight.
After, the rejoicings, eight horses and princely armour are given to Beowulf. The minstrel sings of the hero Finn, with a pleasant description of the coming of spring after a long winter. The poem is not all about fiends and fighting; the descriptions of wild rocks and seas, and of happy nature, are beautiful. Then the gracious wife of Hrothgar bids Beowulf farewell, giving him a cup of gold. Other presents are offered, and on so happy a day, wine, not ale, is drunk in hall.
But Beowulf s adventure is not ended. That night he slept, not in hall, but in a separate room, and the mother of Grendel, a creature more terrible than himself, came to avenge her son, and slew a warrior.
Next day Hrothgar described to Beowulf the home of the fiends; they abode in dark wolf-haunted places, windy "nesses," or headlands, wild marshlands, where the hill-stream rushes through black shadows into a pool or perhaps sea-inlet, under the earth. The boughs of trees hang dense over the water, and at night a fire shines from it. Even the stag that ranges the moors, when he flies from the hounds to the lake, dies rather than venture there to take the water. This is a fine example of the descriptions of nature in the poem. Beowulf is not alarmed; we must all die at last, he says, but while we live we should try to win glory.