The Pedersöre (Pietarsaari) church is one of the oldest in Ostrobothnia. There have been wooden churches from the 13th century and the present stone church was built 1510-1520.
The church was modified to cross shape in 1787-1795 by famous church builder Jakob Rijf. Pedersöre Church was damaged badly by fire in 1986. It was supposed to be an arson, but any suspects were never found.
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.