Trennstein Castle

Trennstein, the former Treunstein Castle, was first mentioned in a document in 1117. It is presumed that a wooden castle stood on this site previously. However, with Rudolf and Konrad von Kindberg von Treunstein, the Mürz lineage died out in 1190. Around 1240, there was again an Ortolf von Treunstein, who had inherited the property from the territorial princely ministeriales. Treunstein then passed to Ortolf's son Wulfing von Treunstein and finally to Marktwart von Mistelbach and Hartnit von Kranichberg. Hartnid ceded his half of the castle to the Stubenbergers in 1345. In 1350, the Stubenbergers also bought the second half of the castle.

Since a large part of the property around Treunstein belonged to the Gutenbergs, Trennstein was administered from Gutenberg. In 1617, the Stubenbergers sold Trennstein to Baron Balthasar von Thannhausen. From this point on, the castle was left to decay. Although the remains of the cellar building are still preserved today, everything usable from the ruined castle was moved to Sturmberg and Altradmannsdorf and used for the construction of nearby farms. Since 1806, the Trennstein ruin has been owned by the Imperial Barons von Gudenus.