The castle in Kętrzyn wasn’t as important as other nearby castles, even though it was built around the same time, in the second half of 14th century. It was the seat of Teutonic prosecutor. Due to lower military significance, only some ammunition was stored here.
During 15th century the castle went from Polish to Teutonic hands and back again. First, king Jagiełło took the castle, then the citizens rebelled in order to drown the local prosecutor. After secularisation of Prussia, the castle became the seat of the local starost. It was expanded over the next centuries before it burned down in the end of 18th century.
In the beginning of 20th century, city bought the castle and…. turned a part of it into flats. IT was restored in the 60s and given back it’s gothic looks.