Stiklestad Church was built at the site of the Battle of Stiklestad and completed in 1180. During the battle in 1030, St. Olaf received three severe wounds—in the knee, in the neck, and the final mortal blow through the heart—and died leaning against a large stone. The church building is assumed to have been erected on the exact spot where St. Olaf was killed during that battle and that stone is supposedly still inside the altar of the church. The church was designed by Archbishop Øystein Erlendsson.
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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.