Reichenbach castle (Schloss Reichenbach) is located in Zollikofen, about 5 kilometres north of Bern. The castle was founded as a medieval fort, probably built on the site of an earlier Roman fort, on the river Aar. The medieval castle was later rebuilt in the Baroque style. It is a Swiss heritage site of national significance. Geology of the area About 14,000 years ago, the ice age came to the end. During the ice age the area was covered with up to thick ice packs. The relatively soft sandstone and limestone rock formations north of Bern were eroded by the Aar river. Over thousands of years the Aar carved loops in the terrain, and changed direction. In the area below the castle, the river changed direction by 180 degrees. This produced a slightly elevated place which provided a good observation point up and down the river. Archaeology of the area Scattered archaeological findings suggest that the area of the Zollikofen and the nearby Enge peninsula have been inhabited since the Bronze Age (about 1300 BC). The Aar river formed a natural barricade protecting the area. This natural fortification was used by the Celts, and later the Romans. On the peninsula protected by the Aar a large Celtic settlement grew up. This was replaced or expanded by the Romans when they conquered the region. The site of Reichenbach castle was, probably, originally a Roman river fortress or castra. It is not entirely clear how the castra was connected to the peninsula although a Roman era paved road has been found. This road led to a bridge over the Aar. By the time of the Alamanni, in the middle of the 5th century, very little of the fortress remained. The Roman soldiers had departed and the new occupants built mostly in wood. However, the name Zollikofen is most likely of Alemannic origin (Cholinchove). History of the castle While a Roman fort existed, it is unclear if during the time of the Alamanni it was maintained or allowed to decay. During its long history, the castle changed ownership many times. The first documentation of the castle is at the beginning of 14th century when it was purchased by Rudolf von Erlach, the victor of the Battle of Laupen, who was to rule from Reichenbach castle over the surrounding area. The castle remained in the von Erlach family until 1530. It was acquired by Beat