St. Jacob's church was built in the 11th and 12th centuries outside the fortifications around Cathedral Hill, and was used by numerous Jacob pilgrims on their way to Santiago de Compostela. Initially, the church was modelled around Heinrich's cathedral and was constructed as a column basilica. In 1771 the baroque facade was added, behind which numerous components from the romanesque period can still be discovered. Inside it is impossible to overlook the many romanesque elements.
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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.