{"id":3675,"date":"2026-02-07T18:37:37","date_gmt":"2026-02-07T18:37:37","guid":{"rendered":"https:\/\/www.europesays.com\/dk\/3675\/"},"modified":"2026-02-07T18:37:37","modified_gmt":"2026-02-07T18:37:37","slug":"medieval-ship-discovered-off-copenhagen-may-be-the-worlds-largest-cog","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/dk\/3675\/","title":{"rendered":"Medieval ship discovered off Copenhagen may be the world\u2019s largest cog"},"content":{"rendered":"<p>Maritime archaeologists from the Viking Ship Museum in Denmark have announced the discovery of what they describe as the world\u2019s largest cog\u2014a medieval cargo vessel built around 1410 and found in the waters (\u00d8resund) between Denmark and Sweden.<\/p>\n<p>From the first dive, archaeologists realised the outline beneath the sand was not an ordinary shipwreck. As centuries of silt were cleared away, the scale of the vessel became apparent: approximately 28 metres long, 9 metres wide, and 6 metres high, with an estimated cargo capacity of around 300 tons. That size, researchers say, reflects just how large late medieval trading ships could become\u2014and offers a rare chance to examine construction details that are usually lost when only the lower hull survives.<\/p>\n<p>\u201cThe find is a milestone for maritime archaeology. It is the largest cog we know of, and it gives us a unique opportunity to understand both the construction and life on board the biggest trading ships of the Middle Ages,\u201d says Otto Uldum, maritime archaeologist and excavation leader.<\/p>\n<p>The wreck, named Sv\u00e6lget 2 after the channel where it was discovered, was located during seabed investigations connected to Copenhagen\u2019s <a href=\"https:\/\/www.arkitema.com\/en\/project\/lynetteholm\" rel=\"nofollow noopener\" target=\"_blank\">Lynetteholm development project<\/a>.<\/p>\n<p>A 15th-century ship built for bulk trade<br \/>\n<a href=\"https:\/\/www.medievalists.net\/2025\/12\/medieval-ship-discovered-copenhagen\/medieval25123003\/\" rel=\"attachment wp-att-107334 nofollow noopener\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-107334\" src=\"https:\/\/www.europesays.com\/dk\/wp-content\/uploads\/2026\/02\/medieval25123003-scaled.jpg\" alt=\"\" width=\"2560\" height=\"1703\"  \/><\/a>Photo courtesy Viking Ship Museum<\/p>\n<p>Cogs were among the most important workhorses of late medieval shipping, and Sv\u00e6lget 2 appears to represent the type pushed to an extreme. Otto Uldum argues that a ship of this scale points to a trade system that was already highly organised.<\/p>\n<p>\u201cA ship with such a large cargo capacity is part of a structured system where merchants knew there was a market for the goods they carried,\u201d he notes. \u201cSv\u00e6lget 2 is a tangible example of how trade developed during the Middle Ages.\u201d<\/p>\n<p>Cogs could be sailed by a relatively small crew, even when heavily loaded, helping merchants move large volumes efficiently. Larger cogs were built to tackle risky routes, including the hazardous voyage around Skagen, travelling from what is now the Netherlands through the Sound and on to Baltic trading towns. Sv\u00e6lget 2, archaeologists suggest, fits squarely into the extensive networks that connected Northern Europe in the 15th century.<\/p>\n<p>\u201cIt is clear evidence that everyday goods were traded. Shipbuilders went as big as possible to transport bulky cargo \u2013 salt, timber, bricks or basic food items,\u201d Uldum adds.<\/p>\n<p>Timber from Pomerania and the Netherlands<br \/>\n<a href=\"https:\/\/www.medievalists.net\/2025\/12\/medieval-ship-discovered-copenhagen\/svaelget-2-2\/\" rel=\"attachment wp-att-107335 nofollow noopener\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-107335\" src=\"https:\/\/www.europesays.com\/dk\/wp-content\/uploads\/2026\/02\/medieval25123004-scaled.jpg\" alt=\"\" width=\"2560\" height=\"1703\"  \/><\/a>Photo courtesy Viking Ship Museum<\/p>\n<p>One of the most striking results so far comes from dendrochronology (tree-ring dating). Researchers report that Sv\u00e6lget 2 was built around 1410 using timber sourced from two different regions: Pomerania (in modern-day Poland) and the Netherlands. The planks were made from Pomeranian oak, while the ship\u2019s frames (ribs) came from the Netherlands\u2014an arrangement the team interprets as evidence of complex material supply and specialised shipbuilding capacity.<\/p>\n<p>\u201cIt tells us that timber exports went from Pomerania to the Netherlands, and that the ship was built in the Netherlands where the expertise to construct these very large cogs was found,\u201d Uldum notes.<\/p>\n<p>Unprecedented preservation, with rigging still surviving<br \/>\n<a href=\"https:\/\/www.medievalists.net\/2025\/12\/medieval-ship-discovered-copenhagen\/svaelget-2-3\/\" rel=\"attachment wp-att-107336 nofollow noopener\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-107336 size-full\" src=\"https:\/\/www.europesays.com\/dk\/wp-content\/uploads\/2026\/02\/medieval25123005.jpg\" alt=\"\" width=\"2144\" height=\"1424\"  \/><\/a>Fish bones. Photo courtesy Viking Ship Museum<\/p>\n<p>Sv\u00e6lget 2 is also being presented as an unusually well-preserved cog wreck. Excavated at a depth of 13 metres, it was shielded from many of the destructive forces that normally affect coastal wrecks. Sand is said to have protected the ship\u2019s starboard side \u201cfrom keel to gunwale,\u201d giving archaeologists access to upper structures and fittings that rarely survive.<\/p>\n<p>Among the most important elements are traces of the ship\u2019s rigging\u2014vital components for controlling the sail and supporting the mast.<\/p>\n<p>\u201cIt is extraordinary to have so many parts of the rigging,\u201d Uldum explains. \u201cWe have never seen this before, and it gives us a real opportunity to say something entirely new about how cogs were equipped for sailing.<\/p>\n<p>\u201cThe finds show how something as complex as the rigging was solved on the largest cogs. Rigging is absolutely central to a medieval ship, as it makes it possible to control the sail, secure the mast and keep the cargo safe. Without ropes and rigging, the ship would be nothing.\u201d<\/p>\n<p>The first secure archaeological evidence for cog \u201ccastles\u201d<\/p>\n<p>Medieval art frequently depicts cogs with high timber-built platforms\u2014\u201ccastles\u201d\u2014at the bow and stern. Yet archaeologists have long lacked definitive physical evidence for these structures, largely because wrecks typically preserve only the lower hull. According to the <a href=\"https:\/\/www.vikingeskibsmuseet.dk\/en\/\" rel=\"nofollow noopener\" target=\"_blank\">Viking Ship Museum<\/a> team, Sv\u00e6lget 2 changes that.<\/p>\n<p>\u201cWe have plenty of drawings of castles, but they have never been found because usually only the bottom of the ship survives,\u201d Uldum says. \u201cThis time we have the archaeological proof.\u201d<\/p>\n<p>Researchers report extensive remains of a timber-built stern castle, described as a covered deck where crew could shelter from the elements\u2014particularly significant on large merchant voyages.<\/p>\n<p>\u201cWe now have 20 times as much material to work with. It is not comfort in a modern sense, but it is a big step forward compared to Viking Age ships, which had only open decks in all kinds of weather,\u201d Uldum adds.<\/p>\n<p>A brick-built galley and traces of meals at sea<br \/>\n<a href=\"https:\/\/www.medievalists.net\/2025\/12\/medieval-ship-discovered-copenhagen\/medieval25123007\/\" rel=\"attachment wp-att-107340 nofollow noopener\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-107340 size-full\" src=\"https:\/\/www.europesays.com\/dk\/wp-content\/uploads\/2026\/02\/medieval25123007.jpg\" alt=\"\" width=\"2144\" height=\"1424\"  \/><\/a>Fragment of a turned wooden dish, approximately 25% preserved. Original diameter about 40 cm, height about 3 cm, thickness about 5 mm. The decoration consists of incised contours with applied color: radial triangular lines on the center, a checkerboard pattern (approx. 7\u00d77 mm) on the rim, and a narrow band with intersecting zigzag lines. The paint now appears black-gray with traces of lighter colors. The dish shows no signs of use. Photo courtesy Viking Ship Museum<\/p>\n<p>Another major surprise is the ship\u2019s brick-built galley, described as the earliest example of its kind from Danish waters. Archaeologists report finding around 200 bricks and 15 tiles, along with bronze cooking pots, ceramic bowls, and food remains.<\/p>\n<p>\u201cWe have never before seen a brick galley in a medieval ship find from Danish waters. It speaks of remarkable comfort and organisation on board. Now sailors could have hot meals similar to those on land, instead of the dried and cold food that previously dominated life at sea,\u201d says Otto Uldum.<\/p>\n<p>In the same area, the team also found hundreds of finely cut sticks that may have been used for stockfish\u2014one more hint of the ship\u2019s provisioning and daily routines.<\/p>\n<p>Shoes, combs, rosary beads: everyday life on a merchantman<br \/>\n<a href=\"https:\/\/www.medievalists.net\/2025\/12\/medieval-ship-discovered-copenhagen\/kam_foru2022\/\" rel=\"attachment wp-att-107337 nofollow noopener\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-107337 size-full\" src=\"https:\/\/www.europesays.com\/dk\/wp-content\/uploads\/2026\/02\/Kam_foru2022-e1767131254348.jpg\" alt=\"\" width=\"1533\" height=\"1157\"  \/><\/a>One of two combs that were found in the shipwreck. Both are made of wood and feature fine teeth on one side and larger teeth on the other. Combs were common tools in the Middle Ages and were used both for hair care and for keeping hair free of lice. Photo courtesy Viking Ship Museum<\/p>\n<p>Beyond the ship itself, Sv\u00e6lget 2 has yielded personal and domestic objects that rarely survive in such quantity. The excavation uncovered painted wooden dishes, shoes, combs, and rosary beads, alongside cooking and eating equipment.<\/p>\n<p>\u201cThe sailor brought his comb to keep his hair neat and his rosary to say his prayers. We have the remains of the pots his food was cooked in and the bowls he ate from. These personal objects show us that the crew brought everyday items with them. They transferred their life on land to life at sea,\u201d explains Otto Uldum.<\/p>\n<p>What was Sv\u00e6lget 2 carrying?<br \/>\n<a href=\"https:\/\/www.medievalists.net\/2025\/12\/medieval-ship-discovered-copenhagen\/medieval25123006\/\" rel=\"attachment wp-att-107339 nofollow noopener\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-107339 size-full\" src=\"https:\/\/www.europesays.com\/dk\/wp-content\/uploads\/2026\/02\/medieval25123006.jpg\" alt=\"\" width=\"1173\" height=\"782\"  \/><\/a>Bronze cooking pot from Sv\u00e6lget 2. Photo courtesy Viking Ship Museum<\/p>\n<p>Despite the ship\u2019s impressive size, archaeologists say they have found no direct trace of the cargo\u2014only items that can be explained as ship\u2019s gear or crew possessions.<\/p>\n<p>The archaeologists suggest that cargo stored in an uncovered hold\u2014such as barrels of salt, bundles of cloth, or timber\u2014could have floated away during the sinking. The absence of ballast, the team notes, may indicate the ship was loaded heavily with trade goods when it went down. Even without the cargo, researchers stress that the evidence points to a merchant vessel rather than a warship.<\/p>\n<p>\u201cThere is no evidence pointing to war or conflict in this ship. None at all,\u201d Uldum stresses.<\/p>\n<p>A ship as \u201ca mirror of society\u201d<br \/>\n<a href=\"https:\/\/www.medievalists.net\/2025\/12\/medieval-ship-discovered-copenhagen\/medieval25123008\/\" rel=\"attachment wp-att-107338 nofollow noopener\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-107338 size-full\" src=\"https:\/\/www.europesays.com\/dk\/wp-content\/uploads\/2026\/02\/medieval25123008.jpg\" alt=\"\" width=\"2048\" height=\"1595\"  \/><\/a>Phot3D model of the shipwreck Sv\u00e6lget 2 after excavation. The 3D models were created using photogrammetry, a technique that combines hundreds of high-resolution photographs to generate precise digital reconstructions of the ship\u2019s structure and details. Image courtesy Viking Ship Museum<\/p>\n<p>For the researchers, Sv\u00e6lget 2 is not only a technological landmark but also a reflection of late medieval economic capacity\u2014financing, organising, and supplying a vessel of this size required more than individual ambition.<\/p>\n<p>\u201cIt required a society that could finance, build and equip these enormous ships that served the Middle Ages\u2019 need for export and import over great distances,\u201d says Otto Uldum.<\/p>\n<p>\u201cPerhaps the find does not change the story we already know about medieval trade. But it does allow us to say that it was in ships like Sv\u00e6lget 2 that this trade was created. We now know, undeniably, that cogs could be this large \u2013 that the ship type could be pushed to this extreme. Sv\u00e6lget 2 gives us a tangible piece of the puzzle and makes it possible to understand how technology and society evolved side by side in an era when shipping was the driving force behind international trade.\u201d<\/p>\n<p>The ship\u2019s components are now undergoing conservation at the Brede Works of the National Museum of Denmark.<\/p>\n<p>Subscribe to Medievalverse<\/p>\n","protected":false},"excerpt":{"rendered":"Maritime archaeologists from the Viking Ship Museum in Denmark have announced the discovery of what they describe as&hellip;\n","protected":false},"author":2,"featured_media":3676,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_share_on_mastodon":"0"},"categories":[6],"tags":[108,3804,3805,3806],"class_list":["post-3675","post","type-post","status-publish","format-standard","has-post-thumbnail","category-copenhagen","tag-copenhagen","tag-medieval-archaeology","tag-medieval-denmark","tag-medieval-maritime-studies"],"share_on_mastodon":{"url":"","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/dk\/wp-json\/wp\/v2\/posts\/3675","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/dk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/dk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/dk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/dk\/wp-json\/wp\/v2\/comments?post=3675"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/dk\/wp-json\/wp\/v2\/posts\/3675\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/dk\/wp-json\/wp\/v2\/media\/3676"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/dk\/wp-json\/wp\/v2\/media?parent=3675"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/dk\/wp-json\/wp\/v2\/categories?post=3675"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/dk\/wp-json\/wp\/v2\/tags?post=3675"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}