The town of Kętrzyn (until 1946 Rastenburg) was founded by the Teutonic Knights at the Prussian settlement called Rast. Initially there was a wooden watchtower, around which developed a settlement. In 1357 the commander of Bałga Johann Schindekopf granted the settlement civic rights. Shortly thereafter, in the city began construction of the defensive church dedicated to St. George, castle and defense walls.
The Kętrzyn castle was raised in the second half of the 14th century in the south-west corner of the urban battlements. Castle contained a chapel, bakery, kitchen, mill, malt house, brewery, the meat store, grain silos, storage, armory and a powder magazine. The most representative northern wing was occupied by pfleger - prosecutor, official position of the Teutonic Order. After the year of 1525 the castle became the county seat of the Duke of Prussia. In 1910 the castle was taken over by the municipal authorities, Until World War II there was a finance office and housing for authority officials. Initially it had a triangular winged structure, closed on the west side wall with a gate. Numerous of reconstructions over the centuries, adapting the object to perform administrative functions and residential buildings changed the face of the object. In January 1945, the castle was burnt down. During the reconstruction of the castle was restored in the years 1962-1966 the Gothic character of the building. Currently in the Kętrzyn's castle are functioning: the public library and museum by the name of Wojciech Kętrzyński, and as well as with the interesting regional collections.
References:Celje Castle was once the largest fortification on Slovenian territory. The first fortified building on the site (a Romanesque palace) was built in the first half of the 13th century by the Counts of Heunburg from Carinthia on the stony outcrop on the western side of the ridge where the castle stands. It had five sides, or four plus the southern side, which was a natural defence. The first written records of the castle date back to between 1125 and 1137; it was probably built by Count Gunter. In the western section of the castle, there was a building with several floors. Remains of the walls of this palatium have survived. In the eastern section, there was an enclosed courtyard with large water reservoirs. The eastern wall, which protects the castle from its most exposed side, was around three metres thicker than the rest of the curtain wall. The wall was topped with a parapet and protected walkway.