Research into the age of the iconic Cerne Giant has provided some "surprising" and "exciting" results - suggesting the chalk figure dates back to Saxon times.

After 12 months of scientific analysis, the National Trust can for the first time reveal the likely age of the Cerne Giant, Britain's largest and perhaps best-known chalk hill figure.

Generations have speculated about the age and meaning of the club-brandishing giant in a Dorset hillside - was he a depiction of the legendary demi-god Hercules, an ancient fertility symbol or even the soldier and statesman Oliver Cromwell? Another theory suggests that it was carved around the body of a giant who was slain by local people after he terrorised the countryside.

After state-of-the-art sediment analysis - funded by the National Trust, the University of Gloucestershire, Allen Environmental Archaeology and the Pratt Bequest - National Trust archaeologists have concluded the giant was probably first constructed in the late Saxon period.

Independent geoarchaeologist Mike Allen, whose research is helping the trust understand more about the landscape in which the giant was created, said the result was surprising.

"This is not what was expected," he said. "Many archaeologists and historians thought he was prehistoric or post-medieval, but not medieval. Everyone was wrong, and that makes these results even more exciting."

Philip Toms, professor in physical geography at the University of Gloucestershire, studied samples to find out when the sand was last exposed to sunlight. Material taken from the deepest layer - 1m - gave a date range of 700-1100AD, which suggests the giant was first made by late Saxons.

Martin Papworth, National Trust senior archaeologist, said: "The archaeology on the hillside was surprisingly deep - people have been re-chalking the giant over a long period of time.

"The deepest sample from his elbows and feet tells us he could not have been made before 700AD, ruling out theories that he is of prehistoric or Roman origin.

"This probable Saxon date places him in a dramatic part of Cerne history. Nearby Cerne Abbey was founded in 987AD and some sources think the abbey was set up to convert the locals from the worship of an early Anglo-Saxon god known as 'Heil' or 'Helith'

"The early part of our date range does invite the question, was the giant originally a depiction of that god?"

Other samples gave dates of up to 1560, which presented Martin and his team with a conundrum, because the earliest documented record of the giant is a church warden's account of repairing him in 1694.

Martin added: "The science suggests he could be medieval, but intriguingly, surviving documents from Cerne Abbey don't mention the giant.

"In the 16th century it's as if the giant is not there, and John Norden's survey of 1617 makes no mention of him. And why would a rich and famous abbey - just a few yards away - commission, or sanction, a naked man carved in chalk on the hillside?"

Martin's working theory is that the giant may have been a medieval creation, but then - for reasons we may never know - was neglected for several hundred years, before being rediscovered.

"I wonder whether he was created very early on, perhaps the late Saxon period, but then became grassed over and forgotten," he said. "But at some stage, in low sunlight, people saw that figure on the hill and decided to re-cut him again. That would explain why he doesn't appear in the abbey records or in Tudor surveys."

This is consistent with Mike Allen's research, which found that microscopic snails in the sediment samples included species that were introduced into Britain in the medieval period. The archaeological fieldwork and scientific study, however, found no archaeological evidence that the giant was deliberately covered over.

Gordon Bishop, chairman of the Cerne Historical Society, said: "These results are intriguing as well as surprising. What I am personally pleased about is that the results appear to have put an end to the theory that he was created in the 17th century as an insult to Oliver Cromwell. I thought that rather demeaned the giant.

"In fact, it seems highly likely that he had a religious significance, albeit a pagan one. There's obviously a lot of research for us to do over the next few years."

Mike added that the results had shed light more broadly on the phenomenon of chalk hill figures in Britain.

"Archaeologists have wanted to pigeonhole chalk hill figures into the same period," he said. "But carving these figures was not a particular phase – they're all individual figures, with local significance, each telling us something about that place and time."

He said the trust's careful management of the figure, gifted by the Pitt-Rivers family in 1920, had enabled the giant's true age to be revealed.

He added: "The dating of the giant was only possible because the National Trust has preserved and maintained the figure, which otherwise might have been lost to history."

Martin said that to narrow down a date for the giant is "a great thing to achieve" and they are closer than ever.

"Future research could tell us even more about how he changed over time, and whether our theory about his 'lost' years is true," he said.

"When we began the work, some people wanted the giant's age to remain a mystery – but archaeologists want to use science to seek answers. We have nudged our understanding a little closer to the truth but he still retains many of his secrets. He still does have an air of mystery, so I think everyone's happy."

While the sediment samples were being taken, the National Trust commissioned drone footage in order to create a 'fly-through' video, enabling people to explore the giant virtually. The video, produced by Downland Partnership, which can be seen at the top of this page.

Hannah Jefferson, general manager for the trust's West Dorset portfolio, said: "We're hugely grateful for the funding that enabled us to do deeper investigation into the giant and are always keen to hear from individuals and partners who would be interested in supporting the National Trust's work on the many ancient sites in our care. The more we learn about these special places, the better we can care for them."

For more information, visit nationaltrust.org.uk

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