St Donat's Church is a Grade I listed church in Welsh St Donats. Records of 1180 describe the church as a chapel confirmed to the Abbey of Tewkesbury. By 1563 it was known to have served as a parish church for the community. In 1603 it was considered to be a chapel of the church at Llanblethian, but by 1764 it received a stipend from Queen Anne's Bounty and was described as a curacy.
The church was re-plastered in 1996; during this process, the church was stripped of its old coat of plaster, leaving the entire structure bare to stones and mortar. This became an opportunity to do further dating on the building by examining the old mortar. It was thought that the church was constructed some time in the 15th to 16th centuries. but it became apparent that the windows and doors from that time frame were inserted into older walls by examining the mortar. A chancery wall gave evidence of having two lancet windows at one time; this was an indication that at least this portion of the building was constructed in the 13th century.
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.