The Romanesque style apse of Igelösa Church was built in the 12th century. The tower and vaults were added in the 15th century. Two choirs were added in the 17th century. There are two sarcophagi in the so-called “Gyllenkrookska koret”, which is the grave of Axel Gyllenkrook and his wife. The current appearance dates from 1859, when the church was restored by the design of C. G. Brunius. The altarpiece and pulpit were moved to the church in 1732. The baptismal font dates from the original church.
References: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.