St Mary's Church is dated mainly to the 14th century, though significant alterations were added in the 16th century. The tower dates to the latter period. The church was extensively renovated by J. Pritchard and J.P. Seddon in 1860. The eastern stained class windows were added by Morris & Co. P.S. Webb was responsible for the patterns while the figures are the work of P.P. Marshall. Among the depictions on these windows are Christ saving Peter from drowning in the sea, Christ miraculously curing a woman, and Thomas the Doubter. The octagonal font dates to the 19th century, while the pulpit was installed in 1942.
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.