Mysterious Roman Dodecahedron to Go on Display in Lincoln

The Norton Disney dodecahedron. Only 33 of these mysterious objects have been found in the UK. Photograph: Norton Disney History and Archaeology Group
The Norton Disney dodecahedron. Only 33 of these mysterious objects have been found in the UK. Photograph: Norton Disney History and Archaeology Group
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Mysterious Roman Dodecahedron to Go on Display in Lincoln

The Norton Disney dodecahedron. Only 33 of these mysterious objects have been found in the UK. Photograph: Norton Disney History and Archaeology Group
The Norton Disney dodecahedron. Only 33 of these mysterious objects have been found in the UK. Photograph: Norton Disney History and Archaeology Group

They are known as one of archaeology’s great enigmas – hollow 12-sided objects from the Roman era with no known purpose or use.

Only 33 of these mysterious dodecahedrons have ever been found in Britain and now one, unearthed during an amateur archaeology dig after 1,700 years underground, is going on public display in Lincoln as part of a history festival.

Found in Norton Disney, near Lincoln, in the summer of 2023, the artefact is one of the largest of its kind ever found, measuring 8cm tall and weighing 254g.

Its excavation was particularly important as it was found where it was placed 1,700 years ago, meaning the site could hold clues as to its purpose. Only three other examples of dodecahedra have been found on archaeological excavations.

Richard Parker, the secretary of the Norton Disney History and Archaeology Group, which found the item, said historians were no closer to finding out what these objects were despite extensive research.

“The imagination races when thinking about what the Romans may have used it for. Magic, rituals or religion – we perhaps may never know,” he told the BBC.

There are no known descriptions or drawings of dodecahedra in Roman literature, making their purpose unclear.

The Norton Disney group said the objects were not of a standard size so were not measuring devices, and they did not show signs of wear so they were not used as tools.

It added that “a huge amount of time, energy and skill was taken to create our dodecahedron, so it was not used for mundane purposes”.

The Norton Disney dodecahedron, made of a copper alloy, is the only example found in the Midlands. It is in excellent condition, with no damage, and finished to a high standard.

Parker said it was found on the top of a hill in a former large pit of some kind and seemed to be deliberately placed there.

The amateur archaeologists who uncovered the object plan to return to the site this summer to try to uncover more clues as to why it was there.

The group was able to only partly excavate the trench where it was found in 2023, along with some fourth-century Roman pottery, owing to time and financial constraints, with the dodecahedron found on the penultimate day of the dig.

They have secured permission to return in 2024 and resume excavation, relying entirely on donations to fund their work.

The Norton Disney dodecahedron has been on display in the National Civil War Centre at Newark Museum in Nottinghamshire, and from Saturday it will be at Lincoln Museum as part of the city’s Festival of History.



Secrets, Spy Tools and a 110-Year-Old Lemon Are on Show in an Exhibition from Britain’s MI5  

01 April 2025, United Kingdom, Richmond: Guy Burgess' passport and briefcase are displayed during a preview of the MI5: Official Secrets exhibition at the National Archives in Kew. (Jonathan Brady/PA Wire/dpa)
01 April 2025, United Kingdom, Richmond: Guy Burgess' passport and briefcase are displayed during a preview of the MI5: Official Secrets exhibition at the National Archives in Kew. (Jonathan Brady/PA Wire/dpa)
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Secrets, Spy Tools and a 110-Year-Old Lemon Are on Show in an Exhibition from Britain’s MI5  

01 April 2025, United Kingdom, Richmond: Guy Burgess' passport and briefcase are displayed during a preview of the MI5: Official Secrets exhibition at the National Archives in Kew. (Jonathan Brady/PA Wire/dpa)
01 April 2025, United Kingdom, Richmond: Guy Burgess' passport and briefcase are displayed during a preview of the MI5: Official Secrets exhibition at the National Archives in Kew. (Jonathan Brady/PA Wire/dpa)

A desiccated 110-year-old lemon that played a key role in espionage history is one of the star attractions of a London exhibition drawn from the files of MI5, Britain’s domestic intelligence agency.

Compact spy cameras, microdots in a talcum powder tin and a briefcase abandoned by fleeing Soviet spy Guy Burgess are also part of the show at Britain’s National Archives, which charts the history of a secretive agency that is – slowly – becoming more open.

MI5 Director General Ken McCallum told journalists at a preview on Tuesday that the organization’s work “is often different from fiction, whether that fiction is George Smiley or Jackson Lamb” – the brilliant spymaster of John le Carré's novels and the slovenly supervisor of MI5 rejects in Mick Herron’s “Slow Horses” series.

Many stories told in the exhibition, however, would not be out of place in a thriller.

The lemon, now black and shriveled, helped convict Karl Muller, a German spy in Britain during World War I. It was found by police in his bedside table, along with another in his overcoat pocket. Evidence at his secret trial showed their juice had been used to write invisible-ink letters detailing British troop movements.

Muller was executed by firing squad at the Tower of London in 1915.

In a coda that would not be out of place in “Slow Horses,” MI5 pretended Muller was still alive and wrote to his German handlers to ask for more money.

“The Germans duly sent more funds and MI5 used the funds to purchase a car,” exhibition curator Mark Dunton said. “And they christened the car ‘The Muller.’

“They then were reprimanded by the Treasury for unauthorized use of expenditure,” he added.

The show includes declassified records held by the National Archives and items loaned from the secret museum inside Thames House, MI5’s London headquarters.

It charts the changing role of an agency that was founded in 1909 as the Secret Service Bureau with an initial staff of two officers.

There are records of its World War II successes, when the agency used captured Nazi agents to send disinformation back to Germany, deceiving Adolf Hitler about the location of the looming Allied invasion in 1944.

Failures include the years-long betrayal of the upper-crust “Cambridge Spies,” whose members spilled secrets to the Soviet Union from the heart of the UK intelligence establishment. Recently declassified MI5 documents on display include the 1963 confession of Cambridge spy Kim Philby, who denied treachery for years before he was exposed and fled to Moscow.

The exhibition also reveals changing attitudes, not least to women. The exhibition includes a 1945 report by spymaster Maxwell Knight discussing whether women could make good agents.

“It is frequently alleged that women are less discreet than men,” he noted, but declared that it was not so, saying that in “hundreds of cases of ‘loose talk’” most of the offenders were men.

There are admissions of past mistakes. The exhibition notes that MI5 was slow to recognize the threat from fascism in the 1930s, and later spent too much time spying on the small Communist Party of Great Britain. MI5 didn’t need to break into the party’s offices – it had a key, which is on display.

There are only a few items from the past few decades, showing how MI5’s focus has shifted from counterespionage to counterterrorism. Displays include a mortar shell fired by the Irish Republican Army at 10 Downing St. in 1991 while Prime Minister John Major was holding a Cabinet meeting.

MI5 only began releasing records to the UK’s public archives in 1997, generally 50 years after the events have passed. Even now, it controls what to release and what to keep secret.

“It would be a mistake to assume everything is in the exhibition,” said author Ben Macintyre, whose books on the history of intelligence include “Operation Mincemeat” and “Agent Zigzag.” But he said it still marks “a real sea-change in official secrecy.”

“A generation ago, this stuff was totally secret,” he said. “We weren’t even allowed to know that MI5 existed.”