The oldest parts of Heda Church were built in the early 1100s. It was renovated to the Cistercian style in the late 13th century. The church was enlarged between 1855-1858.
The most interesting detail in Heda church is the fine collection of medieval wooden sculptures. The most famous of these is a remarkably well preserved wooden sculpture of the Virgin Mary as Queen of Heaven, which is more than eight hundred years old. The church also possesses other images of the Madonna, a thirteenth century oak crucifix, a medieval image of John the Baptist and a fifteenth century triptych, made locally. There are ancient rune stones built into the church wall.
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.