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To this day, visitors leave the Runestone Museum in Alexandria, Minn., unsure of who really carved one of Minnesota’s greatest mysteries, the Kensington Runestone.

At the turn of the 20th century, a Swedish farmer in central Minnesota discovered a 202-pound slab of gray sandstone tangled in the roots of a tree. Covered in what appeared to be ancient Germanic letters known as runes, many thought the stone was a relic left by a small group of Nordic explorers as a chronicle of their journey more than 100 years before Christopher Columbus set sail from Spain.

The discovery set off a fierce scholarly debate over the rune stone’s authenticity. The lingering mystery behind the artifact led a read­er to reach out to the Star Tribune’s community-driven reporting project, Curious Minnesota, to ask: “What’s the truth behind Min­ne­so­ta’s Kensington Runestone?”

Af­ter Swed­ish im­mi­grant Olof Öhman un­earthed the rock on his farm in Kensington in 1898, it immediately became a subject of fascination for ge­olo­gists, runologists, lin­guists and fervent Scan­di­nav­ians.

“Ev­er­y­one who’s very in­ter­est­ed in the rune stone is also very pas­sion­ate a­bout what they be­lieve,” said Aman­da Seim, ex­ec­u­tive di­rec­tor at the Runestone Museum. “They tend to be a­bra­sive to peo­ple with different ideas.”

TThe inscription of Swedish runes on the stone de­scribes the mas­sa­cre of a group of Nor­we­gians and Swedes in cen­tral Min­ne­so­ta in 1362, over a cen­tu­ry be­fore the Niña, Pinta and Santa María came to America.

“The in­scrip­tion told a re­al­ly in­ter­est­ing sto­ry and that nar­ra­tive is some­thing that Min­ne­so­tans and many Eu­ro­pe­an Ameri­cans found to be compelling,” said David Krueg­er, a historian and author of a book about the Kensington Runestone. “It appealed to Scandinavian immigrants because this artifact could prove to these newcomers that their ancestors had already come to this land.”

Hen­rik Wil­liams, a professor at Sweden’s Uppsala University and one of the world’s top auth­ori­ties on rune stones, said the language on the stone looks like modern Swedish, rather than anything spoken or written in the 1300s.

“The single most compelling piece of evidence that proves the Kensington Runestone to be a 19th century product is the system of runes used, which doesn’t occur before late in that century and must be a rather modern development,” Williams wrote in an email. “No scientific evidence of any kind supports a 14th century dating.”

Nevertheless, the stone rais­es interesting ques­tions regardless of its au­then­tic­i­ty.

For instance, or­gan­ic ma­te­ri­al tests re­vealed the stone had been bur­ied for about 25 years be­fore Öhman found it, sug­gest­ing the Swedish farm­er may not be a hoaxer, according to Seim.

“It puts the Öhman fam­i­ly back in Sweden, but it doesn’t legitimize the stone,” she said.

There is a small community that argues the stone is authentic and Öhman’s discovery is evidence of early European travelers who made it to the heart of America hundreds of years before the first French explorers arrived. Some say the stone’s weathered edges suggest it is more than 200 years old and point to Öhman’s grandson, who vehemently denies a possible hoax.

While the identity of the Kensington Runestone’s carver remains a mystery, Williams said it should still be approached as a tool for raising further questions.

To that end, the Runestone Museum recently cre­at­ed a 3-D mod­el of the stone that it plans to put on its website for peo­ple to study from remote lo­ca­tions.

“It’s a very cool artifact but we need to know more about it,” Seim said. “We need to do more tests and have an open mind.”

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