The poems of the Pearl manuscript

In October 2023, Rhysida, a hacker group, attacked the online information systems of the British Library. They demanded a ransom of 20 bitcoin, at the time around £596,000, to restore services and return the stolen data. When the British Library did not acquiesce to the demands, Rhysida publicly released approximately 600GB of leaked material online. Services at the library were severely disrupted for months. It has been described as "one of the worst cyber incidents in British history".