In the late 1400s Kulla Gunnarstorp was known as Gundestrup and it belonged to the Pardsberg family. In the mid-1500s it was acquired by Jörgen Brahe, who built the older castle which still exists. After him it has been owned by famous Sparre, De la Gardie and de Geer families. The newer castle was built by Baltzar von Platen in 1865-1868. This was designed by Danish architect Christian Zwingmann. Today the estate is private owned.
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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.