he first mention of the castle in Koło can be found in Jan Długosz, who writes that it was built by Casimir the Great. It was founded on the Warta River at a distance from the settlement, which was granted city rights by the king in 1362. Wide defensive walls closed an area similar to a rectangle with sides of about 70x45 meters. In the southern corner there was a huge tower at the base, square and above round, it protruded slightly in front of the face of the walls, and in its dungeons there was a prison. Today it is over 16 meters high. Stone was used to build the foundations and ground floor, and bricks above. The gate was located next to the tower in the eastern section of the walls. From the outside, a residential building adjoined the western section of the perimeter walls, the remaining buildings
photo by ZeroJeden, III 2005
inside the walls were wooden.
At the castle in Koło, after the Battle of Grunwald with the Teutonic Knights, decisions were made about the continuation of the war. When the Prussian Confederation was established its representatives met with Casimir Jagiellon also in the Kola Castle. Later, congresses of the Greater Poland nobility took place here.
When the Swedes invaded Poland, the king's envoy Krzysztof Przyjemski negotiated with the Swedish ruler Charles Gustav in Koło. The invaders, however, occupied the castle and continued their invasion of the Polish-Lithuanian Commonwealth. When they retreated, they damaged the Kola stronghold, which since then has been gradually falling into ruin. At the end of the 17th century, it was the property of the Bernardines, who had a monastery here for some time, but during the 18th century they gradually dismantled the buildings and left them in 1768.
The uninhabited walls were still dismantled during the 19th and early 20th centuries, and only after the Second World War were the remains protected from further destruction.
Woodcut, Friend of the People 4, 1844 from the collection of the Library of the Institute of Literary Research of the Polish Academy of Sciences
During archaeological research conducted in 1976, the foundations of the aforementioned building were discovered at the western wall, which was previously unknown. Further research was conducted here by Łucja Pawlicka-Nowak.
Currently, the castle is well secured as a permanent ruin.
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e first mention of the castle in Koło can be found in Jan Długosz, who writes that it was built by Casimir the Great. It was founded on the Warta River at a distance from the settlement, which was granted city rights by the king in 1362. Wide defensive walls closed an area similar to a rectangle with sides of about 70x45 meters. In the southern corner there was a huge tower at the base, square and above round, it protruded slightly in front of the face of the walls, and in its dungeons there was a prison. Today it is over 16 meters high. Stone was used to build the foundations and ground floor, and bricks above. The gate was located next to the tower in the eastern section of the walls. From the outside, a residential building adjoined the western section of the perimeter walls, the remaining buildings 
