The Kolding cog is a shipwreck that was found in Kolding Fjord in 1943.
18 m long cog built of oak around the year 1190.
The wreck was examined by the National Museum of Denmark in 2001.
The study discovered that the Kolding cog had a stern rudder thus making it the oldest known ship to have one.
This article about a shipwreck is a stub.