Rabenstein Castle is the smallest medieval castle in Saxony. It is located in the Chemnitz suburb of Rabenstein and belongs to the Chemnitz Castle Hill Museum.
The hill castle Rabenstein was first mentioned in 1336 in a document from Louis IV, Holy Roman Emperor in which he promised it as a fief to his son-in-law Frederick II, Margrave of Meissen, in case the line of Waldenburg were to die out without male heirs.
At this time the castle was larger than the current. The castle walls consisted of a 180 m long wall, which enclosed an area of two hectares.
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.