The Gribshunden was the royal flag ship of the navy of Denmark and Norway when it set sail to bring King John (or Hans) to Sweden to try to negotiate for the Swedish Crown. It would never arrive at its destination and there would not be peace in the region for two more years as a result. The wreck is wonderfully preserved in the cold Baltic waters however, and has proven to be a endless source of medieval artifacts for modern archeology. 

Name: The Gribshunden

Built: Unknown

Sank: 1495

Reason for Sinking: Fire and Explosion

Type: Carvel 

Source: 

https://www.smithsonianmag.com/smart-news/archaeologists-discover-500-year-old-atlantic-sturgeon-royal-danish-shipwreck-180975744/

https://www.visitblekinge.se/en/gribshunden-shipwreck

https://www.medievalists.net/2021/02/new-finds-gribshunden-shipwreck/

https://www.crafoord.se/utvaldabidrag/gribshunden-shipwreck-a-short-report-from-the-2019-excavation/

 https://www.smithsonianmag.com/history/extraordinary-500-year-old-shipwreck-rewriting-history-age-discovery-180978825/

 https://www.sciencedirect.com/science/article/pii/S1125786521000576

https://combatarchaeology.org/the-loss-of-the-kings-flagship-gribshunden-1495-an-unknown-historical-source-surfaces/

https://www.britannica.com/place/Kalmar-Union

https://www.britannica.com/biography/John-king-of-Denmark-Norway-and-Sweden