Arnstein Abbey is a former Premonstratensian abbey on the Lahn River. The history of the monastery dates back to the second half of the 11th century. In 1052, an Arnstein Castle on the Lahn is first mentioned as the seat of the Counts of Arnstein. This is the oldest mention of any castle on the river. Nothing remains of the structures of that period.
In 1139 Louis (Ludwig) III, the last Count of Arnstein, transformed his castle into a Premonstratensian monastery and himself joined the order. His wife lived until her death as hermit near the monastery. In the same year, Lugwig began the partial demolition of the castle. In 1145, King Conrad III confirmed the abbey as directly under the Empire. From 1236, a branch monastery, Keppel Abbey at Hilchenbach, was established under the patronage of the House of Nassau.
Burials in the monastery include Count Walram I of Nassau in 1198. Walram's grandson Henry (Heinrich) (son of Count Henry II of Nassau) became a monk in Arnstein Abbey in 1247.
In 1360, the monastery church was completed. The structure includes individual components which have been dated to the 12th century.
In 1803, the monastery was dissolved during secularization and came into the possession of the Principality of Nassau-Weilburg. In 1919 the Congregation of the Sacred Hearts of Jesus and Mary established Arnstein as their first monastery in Germany. The Superior and Vice-Provincial of the monastery, Pater Alfons Spix, died in 1942 in the Dachau concentration camp, because he let the Polish forced laborers participate in worship and gave them breakfast.
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.