A church at the site of Sant'Agata was present by the 8th century, when the neighborhood was located outside the city walls, but after the 1184 fire destroyed the ancient church, it was reconstructed in the 15th-century in Gothic style. Destruction by fire of this church was somewhat paradoxical, since Saint Agatha was the saint invoked for protection against fires. Further modifications were completed along the centuries, leading to a pastiche of styles. The incomplete 14th-century facade has a Renaissance architecture facade, decorated with Baroque statuary.
Inside, the presbytery dates from the 15th century, the ceiling from the 16th century, the altars and fresco decoration from the 1680s, and the chapel of the Santissimo Sacramento is from the 18th century. The main altarpiece depicting Sant'Agata with Saints Peter, Paul, Lucia, Apollonia standing before the cross (1522) is a masterwork by Francesco Prata from Caravaggio.
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.