The cathedral church of St. James the Elder is situated within the old quarter next to the city walls and in the past it could fulfil a defensive function. It was built in stages from 1380 until 1445 and finally completed in its present shape during the early 17th c. The building was erected on the rectangular plan of ceramic bricks, with nave and two aisles, hall type, without separate presbytery. Late Gothic vaulting is late 16th c. During the same time (1562-1596) the tower was added. Piotr Olszewski designed chapels flanking the tower in 1721.
The interior décor is mainly new gothic. The older elements are: in the left aisle a late Gothic triptych from early 16th c., in the right aisle the painted triptych – “Crucifixion” of 1553 in new-gothic framing. The main altar and pulpits in new-gothic style. In the baptistery chapel a Baroque 18th c. painting of the Virgin of the Rosary surrounded by St, Catherine of Siena and St. Dominique. Initially the church was a parish church of St. James the Elder, patron of the town later raised to the distinction of a joint cathedral.
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.