'A remarkable time capsule': The enchanting history of Oxford University's 750-year-old medieval library

Predating the Aztec Empire, Merton College Library in Oxford has been used by everyone from celebrated 14th-Century mathematicians to JRR Tolkien. In an exclusive interview with the BBC for its 750th birthday, its librarian describes what makes it so special.

At Merton College in Oxford, there is an antique chest. In the Middle Ages, three key-holders had to be summoned to reveal the riches within. But this treasure wasn't gold or jewels. It was books.

Such strict security may sound overly cautious for mere parchment. But in an era before the printing press, books were a valuable commodity. They could take months to produce, as the entire text had to be painstakingly written out by hand. So, just as universities solicit cash from their alumni today, Merton College insisted its 13th-Century fellows donated books.

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The Archbishop of Canterbury issued a decree in 1276 introducing this requirement, which marked the beginning of the library at Merton College. It has been running continuously ever since. To put that length of time in context, Merton's library predates the Aztec Empire. Its unbroken history stretches from before the Black Death to beyond the Covid-19 pandemic. And its users have encompassed everyone from famous 14th-Century mathematicians to Lord of the Rings author JRR Tolkien.