Geras Abbey is a Premonstratensian monastery founded in 1153 as a daughter house of Seelau Abbey by Ekbert and Ulrich of Pernegg. It was and settled by canons from Seelau. Geras Abbey was able to survive the reforms of the Emperor Joseph II and the consequent monastery closures of 1783, and remains in operation to this day.
The abbey church is a Romanesque basilica which was reworked in the Baroque style in the 18th century by the architect Josef Munggenast and the fresco painter Paul Troger. Today the abbey is often used as a venue for classical music recitals.
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.