A British man whose attempt to steal to one of the original copies of the Magna Carta from Salisbury Cathedral was thwarted in part by tourists has been sentenced to four years in prison.

Mark Royden, from Canterbury, UK, was convicted of using a hammer to try to smash the security case holding the document in October, 2018.

When he failed to break the protective glass, he was apprehended by several visitors to the cathedral and staff members.

Salisbury Cathedral’s Magna Carta is one of the four surviving specimens of the 1215 charter that established the principle that the king is subject to the law. It is considered the founding document of English law and civil liberties and influenced the creation of the US Constitution.

“Magna Carta is a document of huge importance to our country and many other countries that share our democratic traditions,” Judge Richard Parkes said in passing the sentence. “This was a determined attempt on a document of huge historical importance.”

The judge praised the “courageous” acts of visitors and staff members who thwarted Royden, including tourists Matthew and Alexis Delcambre of New Iberia, Louisiana.

Matthew Delcambre said at the time of the theft attempt that he and his wife were sightseeing in the southwestern English city when she saw a man coming out of the disabled persons bathroom with a hammer.

After she tried to alert others, Delcambre and other bystanders banded together to try to hold the thief back behind the doors of the cathedral’s Chapter House.

When the thief pushed past them, Delcambre gave chase into an outer courtyard. He grabbed the man’s arm near the courtyard gate and knocked away the hammer. A church employee tackled Royden and held him down.

Defense attorney Nicholas Cotter said a car accident in 1991 had “tragically” affected Royden, causing him brain damage and leading him to be the subject of a court protection order.