Originally Loosdorf Castle was built as a fortress in medieval times. It was first officially mentioned in 1320, however, based on certain archived documents it was most likely built already in the 10th century. In the course of the Thirty Years' War and due to a massive fire in 1645 parts of the castle were destroyed. Afterwards the castle changed its owners frequently. In 1740 the Liechtenstein Family became the owner of the castle. Between 1760 and 1810 Emmanuel Duke of Liechtenstein executed a lot of construction and decoration works in and around the castle. Based on its long-standing history the castle shows medieval, classicistic and renaissance elements.
1834 Count Friedrich Piatti acquired Loosdorf castle and moved the family residence and their porcelain collection from Dresden to Loosdorf. They were the first Piatti's who partly lived there. Since then the castle is in the possession of the Piatti Family.
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.