A Monster Calls
“The poem’s history in the popular imagination is surprisingly short, given that it is set in sixth-century Scandinavia, and may have been composed around that time: it was published just 200 years ago this year. Though the oral folktale passed for generations from bard to bard, and was written down by two unknown scribes at the dawn of the last millennium, it vanished as the Dark Ages receded. The sole surviving manuscript reappeared in the 1500s, and circulated among private collectors before finding its way into the extensive archives of Sir Robert Cotton. These were damaged by a fire at the ominously named Ashburnham House in 1731. Two decades later, in 1753, the flame-singed codex was stowed in the bowels of the British Museum, lost and long forgotten. In all this time a tiny snippet of the poem appeared only once in print.”
— Here’s a nice (and brief!) piece on unlikely survival of Beowulf.