Kristianopel (originally founded as Christianople) was established by the Danish king Christian IV in 1603 as a fortress city and named after his newborn son - Christian, or Kristian, with Danish spelling. The Greek suffix '-opel' was given to give the town a cosmopolitan ring similar to Constantinople. Construction of the town was completed in 1606.
The first church was built in 1600, but burnt down only eleven years later by Swedish army. The current churc was built of stone between 1618-1624. The chandelier dates from the former Avaskär church. Tje pulpit dates from 1621 and altar 1624. There is also a royal chair of Christian IV (1635).
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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.