Why Thomas Becket still divides opinion

Visitors to the British Museum’s new exhibition will become acquainted with one of the most gloriously bizarre stories in the history of English Christianity: the tale of Eilward, a 12th-century Bedfordshire peasant. One day Eilward is in the pub when he has the misfortune to run into his neighbour Fulk, to whom he owes a small debt. An angry confrontation follows; eventually Eilward storms off drunkenly — in the direction of his creditor’s house, where he breaks in and starts trashing the place. Fulk catches him red-handed, beats him up and then hands him over to the authorities. One account suggests Eilward was framed; but whatever the truth of the matter, the judge sentences him to blinding and castration.

Eilward’s punishment, as well as what happened next, is among the scenes portrayed in an exquisite stained-glass window at Canterbury Cathedral, now on loan to the British Museum as the centrepiece of Thomas Becket: Murder and the Making of a Saint.