The oldest parts of grey stone church date back to the 15th century. It was built in three periods: the first part probably in 1430s, second maybe in the later half of 15th century and latest in 1510s. The roof was destroyed by lightning in 1623 and the bell tower was built beside 1739-1740.
The Inkoo parish is very old (established in the beginning of 13th century) and it's quite probable there have been wooden churches before the present one.
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.