St Baglan's Church, Llanfaglan, stands in an isolated position in a field some 150 metres from a minor road. The size of the surrounding churchyard and the presence within the structure of the church of a stone dating from the 5th or 6th century is evidence that an earlier church or churches stood on the site. It is traditionally credited to its namesake, the 7th-century saint Baglan ap Dingad. The present church dates probably from the 13th century. The chancel was rebuilt in about 1800, when the north porch was also added. Unusually, the church escaped restoration during the Victorian era, and so its interior is still little changed since about 1800.
Describing the reasons for its Grade I listing, Cadw states it is 'a rare example of a medieval church unrestored in the 19th century, so retaining an exceptionally complete set of 18th-century furnishings'.
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.