The exact history of the Wolfenstein Castle is unclear. The archaeological excavations have dated the construction to the mid-12th century. The first written document dates from 1283 when Gottfried von Sulzbürg changed his name Wolfenstein and started the nobility. Hans von Wolfenstein died childless in 1462 and the castle was moved to the possession of Bohemian (Czech) king. Wolfstein lost its importance in the 16th century after been damaged in War of the Succession of Landshut in 1504. The castle was abandoned and fell into disrepair.
Today, the ruins of Wolfenstein are in good condition. It went through extensive excavations and renovations in the 1990s.
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.