Kungs-Husby Church date from the 14th century and it was enlarged between 1755-57. The medieval frescoes in walls were overpainted in the 18th century, but restored in 1859. The triumph crucifix (made in the 1200s) date probably from the elder wooden church. The limestone madonna statue was made in Rheinland around the year 1340. The Gustavian Classicism style pulpit was carved in 1789 by J. C. Krüger.
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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.