Jesus Church is one of the largest and most important Protestant churches in Poland. The construction of the Lutheran basilica was made possible with the assistance of Sweden's Charles XII, who forced Austrian Emperor Joseph I to provide right for Protestants. Late Austrian Baroque in style, Jesus Church was constructed between 1709-1710 and the bell tower was erected in 1750. In the first two decades of the church's existence, it was a significant center of pietism.
The church has a capacity of 6000 people (sitting on benches) and a lot of standing places if necessary. The Church also houses the Protestant Museum altogether with Tschammer Library which has about 23 000 books in its collection.
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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.