Wilhering Abbey, re-constructed in the 18th century, are known for their spectacular Rococo decoration. The monastery was founded by Ulrich and Kolo of Wilhering, who donated their family's old castle for the purpose in 1146. The abbey almost came to an end during the Protestant Reformation, when Abbot Erasmus Mayer absconded with its funds to Nuremberg, where he married. By 1585, there were no monks left at the abbey, which was only saved by the efforts of Abbot Alexander a Lacu, who was installed by the Emperor during the Counter-Reformation.
The abbey buildings were almost entirely destroyed by fire on 6 March 1733. Of the previous buildings, only a Romanesque doorway, parts of the Gothic cloister and two tombs remained. Abbot Johann Baptist Hinterhölzl (1734-1750) made emergency repairs to the church using the remnants of the walls. The church was later completely rebuilt in the Rococo style by Johann Haslinger of Linz. The ceiling and altar paintings are by Martino Altomonte and his son Bartolomeo, while the richly coloured stucco work is by Johann Michael Feichtmayr and Johann Georg Ueblherr. The result is now one of the most significant Rococo buildings in the German-speaking world.
In 1940, Wilhering Abbey was expropriated by the Nazis, and the monks were expelled; some were arrested and sent to concentration camps, while others were forced into military service. The abbot, Dr. Bernhard Burgstaller, was imprisoned and died of starvation in 1941. The buildings were used at first to accommodate the seminary from Linz, and then from 1944 for displaced Germans from Bessarabia and as a military hospital. In 1945, American troops took over the premises. The monks returned in the same year to resume monastic life and to reopen the school. As of 2007, the monastic community numbered 28.
Today the abbey's business enterprises—mainly forestry, farming, and greenhouses—provide a sound economic basis for the monastery. There is also a school for about 450 children.
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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.