The Salisbury Cathedral 1215 copy of the Magna Carta is installed in a cabinet by Chris Woods, right, the director of the National Conservation Service to be displayed alongside the other three surviving original parchment engrossments of the Magna Carta to mark the 800th anniversary of the sealing of Magna Carta at Runnymede in 1215, in the Queen’s Robing Room at the Houses of Parliament in London, Thursday, Feb. 5, 2015. The four original copies of the charter have been put on display together for one day on Thursday for the opening of the exhibition “Magna Carta and Parliament” which runs during February. The Magna Carta established the timeless principle that no individual, even a monarch, is above the law. In 1215, 40 rebellious barons came together to declare their rights to King John, and he reluctantly consented to their demands in an attempt to avoid civil war. (AP Photo/Matt Dunham, Pool)

LONDON: A British man was jailed on Friday for attempting to steal a priceless 1215 original version of Magna Carta, which has defined rights and liberties around the world.

Mark Royden attacked the protective glass surrounding the manuscript at Salisbury Cathedral in southern England but was chased off by two American tourists and cornered by a group of stonemasons.

The 47-year-old was found guilty in January of attempted theft and criminal damage to the security case costing 14,466 ($18,295, 16,172 euros).

Sentencing him to four years in jail on Friday, judge Richard Parkes said he had made a “determined attempt” to steal a document of “huge historical importance” to the world.

Prosecutors said Royden believed the Salisbury Magna Carta was a fake and that he came equipped to carry out the theft on October 25, 2018 with a hammer, gloves and safety goggles.

Before smashing the protective case, he turned a security camera away to avoid being recorded, and set off a fire alarm as a distraction.

Salisbury Crown Court was told Royden had 23 previous convictions covering 51 offences, including theft and criminal damage against items “of the establishment”.

His lawyer said his client had a serious car accident in 1991 that left him with brain damage, and was a “caring, kind and helpful man” but was “blighted by demons”.

“He has become a pest and a pain, mired in drink and drugs, heroin has been the drug of choice and alcohol has blighted him,” said Nicolas Cotter.

Four original copies of Magna Carta from 1215 remain in existence: two in the British Library in London; one in Salisbury; and another in Lincoln Cathedral, eastern England.

In June 1215, the despotic King John accepted the demands of rebellious barons to curb his powers and agreed to the charter at Runnymede, a meadow by the River Thames west of London. Copies were written out and sent around the country.