St Mary's Church was both the priory church of the medieval Benedictine Cardigan Priory and a parish church. It continues as a parish church.
While the church was a 12th century foundation, the present building dates from the fourteenth century, although substantially rebuilt. In the thirteenth century St Mary's Priory church was the site of the shrine of Our Lady of the Taper, which was demolished at the Dissolution of the Monasteries.
The porch was rebuilt in 1639. In 1705, the tower collapsed; it was rebuilt over the next 40 years and was finally completed in 1748.
The stained glass window in the east wall of the chancel was installed in 1924, and depicts the Crucifixion with the Virgin Mary and St John. Surviving fragments of fifteenth century glass are set in the upper tracery lights.
Dr David Rowlands, Inspector of H.M. Hospitals and Fleets, Royal Navy, died in 1846. He is commemorated by a memorial tablet inside the church.
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.