Hertenstein Castle, Medieval castle ruins in Billingsbach, Germany

Hertenstein Castle is a ruined fortress site located on elevated terrain above Billingsbach. The grounds feature an artificial defensive moat surrounding the hilltop, with scattered stonework marking where the main tower and associated structures once stood.

The fortress was built in the early 13th century as a residential stronghold for the Hertenstein family. Over subsequent centuries it gradually lost importance and eventually fell into ruin.

The castle's name comes from the lords of Hertenstein, a minor noble family who were likely ministeriales of the counts of Hohenlohe; Eberhard von Hertenstein appears as a charter witness in 1314. The family probably died out after 1374, and by 1393 Count Ulrich von Hohenlohe was enfeoffing Rezzo von Bächlingen with part of the castle site. The keep was built of rusticated buckel stones, squared blocks with a rounded outer face.

The site sits on a hillside southwest of Billingsbach village and is accessible on foot. The open ruins can be visited anytime, though they offer little shelter from rain or wind.

The fortress sat along a major trade route connecting the Kunstzelsau region to towns in the Jagst valley. This location allowed it to monitor and control the movement of merchants and travelers passing through.