Beowulf is the conventional title of an Old English heroic epic poem consisting of 3182 alliterative long lines, set in Scandinavia, commonly cited as one of the most important works of Anglo-Saxon literature. It survives in a single manuscript known as the Nowell Codex. Its composition by an anonymous Anglo-Saxon poet is dated between the 8th and the early 11th century. In 1731, the manuscript was badly damaged by a fire that swept through a building housing a collection of Medieval manuscripts assembled by Sir Robert Bruce Cotton. The poem fell into obscurity for decades, and its existence did not become widely known again until it was printed in 1815 in an edition prepared by the Icelandic scholar Grímur Jónsson Thorkelin.
   In the poem, Beowulf, a hero of the Geats in Scandinavia, comes to the help of Hroðgar, the king of the Danes, whose mead hall (Heorot) has been under attack by a being known as Grendel. After Beowulf slays him, Grendel’s mother attacks the hall and is then also defeated. Victorious, Beowulf goes home to Geatland in Sweden and later becomes king of the Geats. After a period of fifty years has passed, Beowulf defeats a dragon, but is fatally wounded in the battle. After his death, his attendants bury him in a tumulus in Geatland.  
   Beowulf is considered an epic poem in that the main character is a hero who travels great distances to prove his strength at impossible odds against supernatural demons and beasts. The poem also begins in medias res (“into the middle of affairs”) or simply, “in the middle”, which is a characteristic of the epics of antiquity. Although the poem begins with Beowulf’s arrival, Grendel’s attacks have been an ongoing event. An elaborate history of characters and their lineages are spoken of, as well as their interactions with each other, debts owed and repaid, and deeds of valour.
   Jane Chance (Rice University) in her 1980 article “The Structural Unity of Beowulf: The Problem of Grendel’s Mother” argued that there are two standard interpretations of the poem: one view which suggests a two-part structure (i.e., the poem is divided between Beowulf’s battles with Grendel and with the dragon) and the other, a three-part structure (this interpretation argues that Beowulf’s battle with Grendel’s mother is structurally separate from his battle with Grendel). Chance stated that, “this view of the structure as two-part has generally prevailed since its inception in J.R.R. Tolkien’s Beowulf: The Monsters and the Critics in Proceedings of the British Academy 22 (1936).” In contrast, she argued that the three-part structure has become “increasingly popular.”
   The events described in the poem take place in the late 5th century, after the Anglo-Saxons had begun migration and settlement in England, and before the beginning of the 7th century, a time when the Saxons were either newly arrived or in close contact with their fellow Germanic kinsmen in Scandinavia and Northern Germany. The poem could have been transmitted in England by people of Geatish origins. It has been suggested that Beowulf was first composed in the 7th century at Rendlesham in East Anglia, as Sutton Hoo also shows close connections with Scandinavia, and also that the East Anglian royal dynasty, the Wuffings, were descendants of the Geatish Wulfings. Others have associated this poem with the court of King Alfred, or with the court of King Canute.