In 1620, in the Staffordshire market town of Bilston, a teenage boy decided he didn’t much fancy going to school. Rather than resort to conventional methods, 13-year-old William Perry claimed that he was possessed by a demon. His symptoms included reacting with spasms to the reading of the first verse of St John’s Gospel and peeing blue urine.

Thousands flocked to Bilston to witness his supposed possession. King James I, who wrote a book on necromancy and black magic, took a personal interest in the case. It was only when the Bishop of Coventry had the bright idea of reading him the equivalent scriptural passage in Greek – a language the boy didn’t speak but the Devil presumably could – and drew no reaction that suspicions were aroused. Perry later admitted to faking his symptoms and dyei

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