Built in 1485, the Danish warship Gribshunden served as the flagship and mobile seat of government for King Hans of Denmark and Norway. In the summer of 1495, Hans set sail for Kalmar, Sweden, where he was set to negotiate with Swedish leader Sten Sture the Elder. The goal of the mission was to convince Sten Sture and the Swedish council to give up their sovereignty and rejoin the Kalmar Union, which had unified much of Scandinavia under a single ruler (and which Sweden had left a few decades before, despite the union being named for a Swedish town).

The ship itself had a role to play: to show Hans’s authority to the Swedish council. It was also laden with goods—from gunpowder weapons to artwork to delicacies—to demonstrate his power.

However, while anchored in the Baltic Sea near the port of Ronneby, Sweden, Gribshunden mysteriously caught fire. Though the king wasn’t on board at the time, many crewmen were, in addition to all those pricey goods. Although the exact number of deaths is unknown, many of the crew of 150 were on board when the ship sank to the bottom of the Baltic with its precious cargo. Despite the loss of his ship, Hans continued his journey to Kalmar, where unfortunately, he never met with Sten Sture. Two years later, in October 1497, Hans defeated Sten Sture at the Battle of Rotebro. He went on to rule Sweden briefly—until they renounced him as king in 1501.

King Hans of Denmark and Norway sailed to Sweden in 1495 to take it over with a show of soft power. His flagship burned and sank before arrival.
King Hans of Denmark and Norway sailed to Sweden in 1495 to take it over with a show of soft power. His flagship burned and sank before arrival. Joseph Brecheisen/Wikimedia/Public Domain

In the 1970s, a local diving club came across a mysterious wooden wreck there, in 33 feet of water. It wasn’t until 2001 that the first archaeological excavations of the ship began, after one of the divers told local archaeologists about what they had found. It was another decade before the remains were identified as those of Gribshunden. All through the excavation of the wreck, remarkably preserved by the cold waters of the Baltic, amazing and sometimes odd artifacts have emerged and attracted media attention. In 2015, there was a nearly perfectly preserved wooden “sea monster” figurehead. In 2019, archaeologists discovered a well-preserved rare Atlantic sturgeon. Further excavations in 2021 revealed something even more remarkable: a treasure trove of spices, plant material, fruits, nuts, and cereals, that somehow survived underwater for more than 500 years.

In a study published in the journal PLoS ONE, Brendan Foley and Mikael Larsson, archaeologists at Lund University in Sweden, examined the finds for new insights into how nobility lived and ate during the Middle Ages, and shed light on how these organic materials survived so long underwater.

Foley and a team had been excavating the stern when they made the finds. “We think, but we’re not sure, that the back part of the ship is probably where the highest ranking individuals were situated,” says Foley. They sifted through the sand and silt and revealed almond shells and peppercorns. They recovered thin strands of saffron by hand. “We took four samples of botanical assemblage that included both local and exotic spices, fruits, and vegetables,” says Larsson, including black mustard, dill, clove, ginger, cucumber, grape, and berries such as blackberry and raspberry. “The botanical remains that really stand out are the exotic spices,” he says. Clove, ginger, and saffron had never been found before in the medieval Baltic.

Archaeologists recovered (clockwise from top left) saffron, black pepper, ginger, and clove from the wreck of <em>Gribshunden</em>.
Archaeologists recovered (clockwise from top left) saffron, black pepper, ginger, and clove from the wreck of Gribshunden. Courtesy Mikael Larsson

Larsson says that their work is the first anywhere in the world to find saffron in such a setting. “Finding it in a botanical assemblage connected to a shipwreck that is connected to a specific event also gives it a lot of context,” says Larsson. According to their study, the more exotic spices and foods would only have been consumed by the society’s wealthiest individuals. They were among the most recognizable markers of social status, especially on a ship. “These were likely foods exclusively for the king and his court,” says Larsson. “But what it also shows is the economical contacts that the royal court had at the time.”

Though the geographical origins of saffron are not completely understood, it is thought to have originated in the eastern Mediterranean, and been grown in Southwest Asia and the Mediterranean basin. Ginger is believed to have originated in Southeast Asia, and cloves are native to Indonesia. Black pepper comes from South India. Despite this time being known as the “Dark Ages” in Europe, the finds show that Scandinavia wasn’t just a backwater of the world economy at the time. “The Danish crown was well integrated with the networks of continental monarchs,” he says. “And it also shows the growing international trade in the late medieval period.”

Very few written records mention the consumption of spices and foods like these in Scandinavia, and their location in the wreckage of Gribshunden answers questions about who would have had access to them. “We suppose that they were used for consumption during the voyage or that Hans planned a feasting event once he arrived at the political meeting to show off his international connections and his knowledge of exotic foods or tastes,” says Larsson.

A photogrammetric model of <em>Gribshunden</em> site, produced by Paola Derudas from Brett Seymour’s images.
A photogrammetric model of Gribshunden site, produced by Paola Derudas from Brett Seymour’s images. Courtesy Brendan Foley.

Another question focuses on how these delicate organic remains were able to survive in the Baltic. “It’s a mystery,” says Foley. “We don’t know, we didn’t find any containers.” When they found the saffron, it was just in a lump in the sediment. “No glass jar around it, no ceramic jar, no wooden box, no silver box,” he says. It may have been stored in some sort of fine textile bag that disintegrated over the years—but somehow the spice remained.

“The Baltic Sea is really weird,” Foley says. For one, it has the lowest salinity found in the global oceans. This, combined with low temperatures and low dissolved oxygen to feed microbes, have given the Baltic a reputation for remarkable preservation of archaeological material, specifically wooden shipwrecks, such as the fully intact Vasa, sunk in 1628 and raised in 1961. “That, to me, is the whole point of looking at shipwrecks,” in the Baltic, says Foley. “Stuff survives in water that just doesn’t survive anywhere else.”

The preservation in the Baltic has the scientists thinking about other bodies of water that share some of its attributes. “With zero dissolved oxygen, low salinity, and right in the middle of the silk and spice routes from the Far East into Europe, that’s on my horizon,” Foley says. “I want to do a comparative study of the sites in the Baltic, Caspian, and Black seas.”