Unlike many early popular works it survives in a single manuscript copy. Scholars refer to this as the Nowell Codex after the Elizabethan antiquarian scholar who compiled the vellum (sheep-skin) codex which includes the 3,184 line poem. Laurence Nowell was the pioneer of Anglo-Saxon Studies in England, and it’s only fitting he preserved the most important work in Old English literature. His patron was the influential Elizabethan courtier Sir William Cecil, for whom he drew some of the first maps of Britain – both large-scale and pocket atlases. This employment gave him access to private libraries, and he was able to create the first Old English dictionary, the Vocabularium Saxonicum. (He was also tutor to Cecil's protégé, the 17th Earl of Oxford who is central to the Shakespeare-authorship controversy.)
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Since then, there have been many translations, retellings and commentaries, the most sought-after being those by Tolkien and poet Seamus Heaney, who also did an audio version.
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One possibility recently suggested by a Kent County archaeologist is that the story is set in England, in Kent, rather than Denmark. He has argued there are references to features such as a Roman road which would not apply to Denmark. The text also has a special ‘flashback’ dedicated to Hengist, the legendary but obscure leader of the English conquest, who founded the first Saxon kingdom of England in Kent. Others have argued that Beowulf’s people the Geats are the same as the Jutes (pronounced Yutes) who Bede said invaded alongside the Angles and Saxons. There is an additional argument possible here regarding Beowulf, that the core of the main ‘Grendel’ story was inspired by a real incident. But this will have to wait for another time as we have not space here to do justice to the argument, which involves an explanation of the monster Grendel’s actual biological species.