The founder and builder of the Reinsberg Castle is not known with certainty. However, the establishment of castle and village Reinsberg is probably due to a German nobleman named Reinhardt who had the castle built in order to protect an agricultural settlement. Already in 1197, the castle is recorded as the seat of a noble family when a member of the Reinsberg (Regensberg) family appears as a witness in a document. Their lordship did not endure for long, as they already lost major parts of their ancestral properties in the 14th century to the Schönberg family who acquired the remainder, together with the castle, in 1411. The castle remained a seat of the Schönberg family for more than 500 years. Part of the estate was a folwark in Krummenhennersdorf which was operated as a separate manor.
In the GDR, Reinsberg castle was a holiday hostel for employees of Kombinat Schwarze Pumpe, afterwards it passed into private property and was used as a hotel until 1995. It stands currently (2019) empty. The park remains accessible to visitors on foot. A local initiative has formed to save the building from ruin. The adjacent bathing park has been the open-air swimming pool for Reinsberg since 1978. The hiking trail Grabentour passes in its immediate vicinity.
The steep slope towards Bobritzsch river is a likely reason for the choice of the site for a castle-like fortification. The unprotected eastern side of the castle is defended by a moat which could only be crossed on a drawbridge. The castle was crowned by a substantial tower.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.