Although the St Augustine's Church dates from 1108, a religious presence is thought to have existed at the approximate location for around a century prior to this. The oldest surviving part of the building, the west doorway, dates from c. 1200. The building was enlarged in 1470, when a nave, tower and chancel were added. The church unusually allowed for the wives of deceased clergymen to hold its living– a Katherine Morgan of Llanrumney Hall did so in 1603. The church was extensively refurbished in the late 19th and early 20th Centuries. The churchyard is believed to have been cleared of ancient burials at some point during the mid-19th Century, as no extant stone is older than this. The tower's clock was installed in 1962. Most of the church's stained glass dates from 1915 (the work of Charles Eamer Kempe), though the pair of Te Deum windows were not added until 1950.
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.