People have been playing chess for centuries—perhaps as far back as the 6th century in India. Among the oldest and most famous chess pieces in the world, are the Lewis Chessmen. These unique artifacts, dating to around A.D. 1150-1200, were discovered on the windswept Isle of Lewis in northwest Scotland in 1831.

According to contradictory accounts, the Lewis Chessmen were found exposed on a beach following a fierce storm, buried 15 feet underground in a stone container or inside a vaulted room of an ancient nunnery. Some even credit bovine intervention—although there are conflicting stories as to whether a cow dug the chess pieces out of the sand with its horn or happened upon them after falling down a hole.

The hoard includes 78 chess pieces, 14 tablemen (pieces for backgammon or similar games) and one buckle that might have been from a bag that once contained the game pieces. Today, 82 pieces are housed in the British Museum in London, 11 are at the National Museum of Scotland in Edinburgh and one chess piece is owned privately.

The Lewis Chessmen experienced modern fame when replicas of the famous play pieces made a prominent appearance in the 2001 movie, _Harry Potter and the S_orcerer's Stone .

Fashioned from walrus ivory harvested from Greenland (except for four pieces carved from whale’s teeth), the figures could be part of as many as five chess sets.

Although the pawns are simple geometric shapes, the other pieces are intricately carved human figures with almost comic appearances that include bulging eyes and expressive faces. Stout kings sit stoically on their thrones, while queens raise their right hands to their jaws in looks of shock or grief. Knights astride small horses brandish spears and shields. In the earliest known instances of bishops in a chess set, the religious figures clasp ceremonial crooks to their cheeks as they raise their hands in blessing.

The style of the chessmen matches other objects that have been conclusively dated to between A.D. 1150 and 1200, just after the end of the Viking Age and a time when Norway ruled the region where the chess pieces were discovered.

Also, the tall miters (headdresses) sported by the bishops have their points in the front and back, an ecclesiastical fashion that did not begin until around 1150. (Prior to that, bishops wore miter points on the sides, which gave them the appearance of having horns sprouting from their heads.)

The ornamentations of the Lewis Chessmen are distinctively Scandinavian, but which Nordic country is responsible for their creation remains unknown.

“Instead of facts about these chessmen, we have clues,” writes Nancy Marie Brown in her book Ivory Vikings: The Mystery of the Most Famous Chessmen in the World and the Woman Who Made Them. Four wild-eyed rooks, biting their kite-shaped shields in a battle frenzy, present some of the biggest clues.

The British Museum’s Frederic Madden recognized the figures as “berserkers”—fierce Viking warriors of the Norse god Odin—based upon his knowledge of Icelandic sagas. “The berserkers are probably the only images of what people back in that time thought the Vikings looked like,” Brown says.

Conventional wisdom among scholars, however, grew that the Lewis Chessmen were likely crafted in Trondheim, Norway, which in the 12th century was home to highly skilled craftsmen, wealthy patrons who could afford expensive walrus tusks and similar-looking carvings.

In 2010, Icelandic natives Gudmundur Thorarinsson and Einar Einarsson garnered newspaper headlines by resurrecting Madden’s theory and pointing to passages in Icelandic sagas that mention the use of bishops in chess games and the key role placed by Icelanders in the walrus ivory trade.

After mining Icelandic sagas, archaeological studies and the history of board games and Viking trade routes, Brown also concluded that it was quite possible that the Lewis Chessmen were products of Iceland. Brown theorizes that the chess pieces were commissioned by Pall Jonsson, a bishop of Skalholt who was educated in England, and crafted by a woman named Marget the Adroit, who according to Icelandic sagas carved walrus ivory “so skillfully that no one in Iceland had seen such artistry before.”

“She was considered one of the best artists of her time. The bishop hired her to beautify his church, construct altarpieces and make luxury gifts to send to friends abroad,” says Brown. These lavish artworks included ceremonial crooks carved from walrus ivory that the bishop sent to his counterparts across Scandinavia between 1195 and 1211, a golden age of Icelandic artistic creativity.

Brown says no archaeological proof has been found that Vikings played chess, but there is a description of them doing so in the sagas. “At the time the Vikings were raiding Europe, people were playing chess in those places so they certainly could have learned about the game and brought it back with them,” she says.

Brown adds that the types of pieces crafted for the chess set give us insight into how 12th-century Scandinavians viewed their predecessors. “The people making them showed no reason not to stick a Viking fighter and a bishop in the same game. There was no tension between the pagan warrior and Christian symbol fighting on the same side.”

Scholars are unsure if the chess pieces ended up on the remote island after a shipwreck or were buried by a traveling merchant or an island resident. Brown says, however, that their presence on the Isle of Lewis speaks to the surprising interconnection between the British Isles and Scandinavia during the Viking Age and beyond.

“The Norse Scandinavian influence was heavy in the British Isles until 1266, so these chessmen are probably a sign of this common culture," Brown says. "Places we think of being far apart were actually well-connected. Iceland was not on the edge of anything. It was pretty central to the luxury trade of the Vikings and through the 13th century.”