The small church of Oratorio di Santa Maria in Valle (also known as Lombard Temple), next to the Natisone river, is a notable example of High Middle Ages art sometimes attributed to the 8th century, but probably later. Included in the old Lombard quarter, it was probably used as Palatine Chapel by the Lombard dukes and king's functionaries. The fine decorations, statues and stuccoes (11th or 12th century) housed in the interior, show a strong Byzantine influence.
Cividale del Friuli, the capital of the first Lombard duchy in Italy has been present in the UNESCO World Heritage Site list since 2011.Cividale del Friuli, thanks to the Lombard Temple, one of the most representative symbols of the Lombard power in Italy, has received this important award being included, together with other Italian cities that preserve prestigious Lombard evidence.
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.