"Le Roman de la Rose" (The Romance of the Rose) was started in 1230 and completed around 1280. It is a medieval French poem styled as an allegorical dream vision and some parts that were later removed are quite steamy.
Its 22,000 lines describe the attempts of a courtier to woo his beloved. It was a medieval blockbuster, at least among the wealthy who could afford books, and a century later Geoffrey Chaucer, author of The Canterbury Tales, adopted and translated it for a new audience.
Now the oldest surviving pages, used as a folder or binding for other documents, have been revealed. Parchment was durable but expensive so it was common for it to be reused.