The oldest part of the Ardre Church is the tower, dating from about 1200. The tower originally belonged to an earlier church building from the 12th century, the nave and choir of which was replaced with the current building circa 1250. The sculptured choir portal originally also belonged to the earlier church.
The interior of the church was heavily remodelled after plans by artist Axel Herman Hägg in 1900-1902, in a neo-Gothic style. The dominating wall paintings are consequently designed by Hägg. A few stained glass windows remain but were complemented by modern replicas during the renovation.
The furnishings of the church are still largely medieval: an altarpiece from the early 14th century, a triumphal cross and baptismal font, both from the middle of the 13th century, and a carved wooden Madonna from circa 1500 are all in their original milieu. The organ is an elaborate Gothic Revival piece, made for the renovation in 1902 and inspired by medieval French organs.
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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.