Kullerstad church is a whitewashed Romanesque stone church dating from the 13th century. It is known of two Gunnar's bridge runestones: according runes there was a man named Håkon who dedicated a bridge to the memory of his son Gunnar. The first runestone was found in the exterior wall of the church of Kullerstad in 1969 and is raised in the cemetery. The second stone was discovered in a church only 500 metres away and is also raised in the cemetery. The second stone informs that Håkon raised more than one stone in memory of his son and that the son died vestr or 'in the West.'
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.