The village of Złotoria in the times of the Polish-Teutonic wars was an important strategic point. In order to secure the border of the Dobrzyń land and to control the actions of the Teutonic Knights, Kazimierz the Great decided to build a castle located in the forks of rivers Vistula and Drwęca. After the king’s death in 1370, the castle fell to Kaźko Słupski, but in 1373 he was succeeded by another pretender to the crown, the prince Gniewkowski Władysław the White, who secretly captured the castles burgurvian Nicholas Romlik. Soon, however, counting on the mercy of king Ludwik of Hungary, Wladyslaw the White returned him the castle. In 1375 Władysław the White with the help of the burgundian knights once again conquered the fortress and organized an invasion of Kujawy, which resulted in the counterattack of the royal forces of Ludwik of Hungary, which in 1376 began a siege of the castle. During the siege of the castle was wounded prince Kaźko Słupski, resulting in him died after a few months. In the beginning of 1377 Władysław the White surrendered the castle to the royal army.
In the years 1379-1392 the castle belonged to Wladyslaw Opolczyk, who received him from Ludwik of Hungary with Dobrzyń land and part of Kujawy. His good relations with the Teutonic Order made him in may 1391 illegally handed over the castle to the Order for 50 thousand florins. It was the cause of King Jagiello’s conflict with the prince. In 1404 Władysław Jagiełło bought it by agreement in Raciąż. On 1409, after an eight day siege by the Teutonic Knights, it was captured and destroyed at the order of Grand Master Ulrich von Jungingen. The Polish crew of the castle was cut off at the sound of music.
In may 1411 the Toruń Peace was concluded, under which the castle returned to the Kingdom of Poland, and the Teutonic Knights undertook to pay compensation for the destruction of about 3 tons of silver. They have never fulfilled this promise, and the castle has not been rebuilt. The second peace of Toruń eventually contributed to the loss of its military significance, as the state border on the Drwęca river was no longer in existence. At the beginning of the nineteenth century it was partially demolished, but dismantling was interrupted because of the very strong mortar used for construction.
Castle of Kazimierz the Great consisted of a quadrangular wall of 35×50 meters, reinforced with buttresses. From the south there was a sprawling, square, buttressed tower and a gatehouse. The location of the main castle house is unknown. Maybe it was from the north.
The preserved elements are a fragment of a square tower in two storeys, a part of the peripheral walls and walls of the outer bailey.
Leksykon zamków w Polsce, L.Kajzer, S.Kołodziejski, J.Salm, Warszawa 2003.