Bzovík castle structure originated by reconstruction of the Cistercian Abbey founded around 1130. Several decades later the Premonstratesian provostship moved here and became the largest feudal estate in the region of Hont. Its fort was repeatedly destroyed in the 15th century.
In 1530 it ended up in hands of Sigismund Balassa who drove out the monks and had the Romanesque monastery reconstructed to the Gothic-Renaissance castle with strong outer fortifications including four corner bastions and the dike. The fort was damaged at the end of the Second World War and reconstructed recently.
Apart from fortifications and bastions, the ruins of the former monastery and part of the Romanesque church in the courtyard survive.
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.