Beowulf the king of the Danes, whose mead hall in Heorot has been under attack by a monster known as Grendel. After Beowulf slays him, Grendel's mother attacks the hall and is then also defeated. Victorious, Beowulf goes home to Geatland (Götaland in modern Sweden) and later becomes king of the Geats. After a period of fifty years has passed, Beowulf defeats a dragon, but is mortally wounded in the battle. After his death, his attendants cremate his body and erect a tower on a headland in his memory. The full story survives in the manuscript known as the Nowell Codex.
Beowulf: The Monsters and the Critics work's wide influence. Tom Shippey wrote that the essay "was seized upon eagerly, even gratefully, by generations of critics". Alvin A. Lee wrote that "Tolkien's manifesto and interpretation have had more influence on readers than any other single study, even though it has been challenged on just about every one of its major points." Seth Lerer wrote that the essay "may well be the originary piece of modern "Beowulf" criticism. … The strategies … control the fundamental assumptions of Old English scholarship for the next fifty years." R.D. Fulk commented that "No one denies the historical importance of this lecture.