The first church in Håtuna was probably built in the 1000’s. Later in 12th century it was replaced with a small Romanesque-style stone church. Oldest parts (like the tower) were included to the present church, which was built in the early 14th century. The brick vaults were made in the 15th century. The steeple collapsed in 1700 and the remaining parts of the tower was demolished during the 1800s. During the restorations in 1873 and 1919-1920 the church was partially reconstructed.
The interior is very rich. There are for example baptismal fonts from the 1200’s, a triumphal crucifix made in the 1300’s and eight wooden sculptures from around 1450 and descended from a medieval altarpiece. There is also a runestone (U 660) erected in the porch (moved there in 1932).
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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.