In historical terms, the Rauhe Kulm is significant. It is the natural center of the Flednitz, the Slavic or naabwendischen settlement. Just below the basalt field, the cone is surrounded by a ring wall. This is preserved only in remnants after major parts of the wall were destroyed by the basal mining in the late 19th century. Archaeological excavations in the years 2004 to 2007 showed that the wall was originally piled up as a wall. The mountain was already around 500 BC during the Celtic period. Colonized so long before the arrival of the Slavs. A pole slot wall could belong to this time. Even in the early Middle Ages, when Slavs inhabited the region around the mountain, the height was fixed. The sequence of ramparts and walls is difficult to determine today, since from the 8th century a huge castle complex was built, which also included stones of earlier ramparts. During the invasions of Hungary in the 10th century, the ramparts were apparently reinforced. A particularly striking find is a small missionary cross of the early Middle Ages (8th to 10th centuries), which could be attached to a string by means of an eyelet. The later built Höhenburg was demolished and destroyed at the same time as the small Kulm.