To be privately owned
CastleOber-Grafendorf-Fridau
Fridau Castle

The "Haus zu Fridau", as the former castle was usually called in the Middle Ages, was built relatively late. It was first mentioned in a document in 1299. At that time, it was owned by Dietrich von Weißenberg. The Weißenburgers were vassals of Melk Abbey and the builders of the first castle.
Source: wehrbauten.at · Image: http://www.wehrbauten.at/noe/niederoesterreich.html
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Location: 48.1496, 15.5561