The Church of Saint-Pierre (Église Saint-Pierre) was built in the early 13th and the construction continued until the 16th century. The spire was destroyed in 1944, and has since been rebuilt. The eastern apse of the church was built by Hector Sohier between 1518 and 1545. The interior choir and the exterior apse display an architecture that embodies the transition from Gothic to Renaissance.
Until around the mid 19th century, the eastern end of the church faced onto a canal that was then covered and replaced by a road. Various artists and engravers recorded this relation of the church to the canal; for instance, the Scottish painter David Roberts made several very similar views, one of which (dated to c.1830) is in Musée des Beaux-Arts in the Château de Caen.
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.