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Frohnleiten was first mentioned around 1300 in a document. The town was founded by the Counts of Pfannberg in order to protect a bridge across the river Mur.

The silhouette of the old town is dominated by the tower of the former Katharinenkirche (St. Catherine's). The church developed out of an earlier chapel of around 1300. The chancel dates from about 1400. The upper parts of the tower were renewed in 1763 following a destruction by fire. In 1788, the church was exsecrated and transformed into residential premises.