Newtownards Priory was a medieval Dominican priory founded by the Savage family around 1244. Only the lower parts of the nave and two blocked doors in the south wall leading to a demolished cloister, survive from the period of the priory's foundation. The upper parts of the nave date from a 14th-century rebuilding and the western extension and the north aisle arcade were undertaken by the de Burgh family.
The priory was dissolved in 1541, and was sacked and burned. It was granted to Hugh Montgomery and he built a house within the ruins, rebuilding the north aisle and adding a tower at the entrance.
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.